fbpx
Wikipedia

7075 aluminium alloy

January 01, 1970

7075 aluminium alloy (AA7075) is an aluminium alloy with zinc as the primary alloying element. It has excellent mechanical properties and exhibits good ductility, high strength, toughness, and good resistance to fatigue. It is more susceptible to embrittlement than many other aluminium alloys because of microsegregation, but has significantly better corrosion resistance than the alloys from the 2000 series. It is one of the most commonly used aluminium alloys for highly stressed structural applications and has been extensively used in aircraft structural parts.[2]

A7075 T6
Physical properties
Density (ρ)2.81 g/cm3 (0.102 lb/cu in)
Mechanical properties
Young's modulus (E)71.7 GPa (10,400 ksi)
Tensile strength (σt)572 MPa (83.0 ksi)
Elongation (ε) at break11%
Poisson's ratio (ν)0.33
Hardness—Rockwell87 HRB
Thermal properties
Melting temperature (Tm)477 °C (891 °F)
Thermal conductivity (k) [1]130–150 W/m*K
Linear thermal expansion coefficient (α)2.36*10−5 K−1
Specific heat capacity (c)714.8 J/kg*K
Electrical properties
Volume resistivity (ρ)51.5 nOhm*m

7075 aluminium alloy's composition roughly includes 5.6–6.1% zinc, 2.1–2.5% magnesium, 1.2–1.6% copper, and less than a half percent of silicon, iron, manganese, titanium, chromium, and other metals. It is produced in many tempers, some of which are 7075-0, 7075-T6, 7075-T651.

The first 7075 was developed in secret by a Japanese company, Sumitomo Metal, in 1935,[3] but reverse engineered by Alcoa in 1943, after examining a captured Japanese aircraft.[4] 7075 was standardized for aerospace use in 1945.[5] 7075 was eventually used for airframe production in the Imperial Japanese Navy.

Basic properties edit

Aluminium 7075A has a density of 2.810 g/cm3.[6]

Mechanical properties edit

The mechanical properties of 7075 depend greatly on the tempering of the material.[7]

7075-O edit

Un-heat-treated 7075 (7075-0 temper) has a maximum tensile strength of no more than 280 MPa (40,000 psi), and maximum yield strength of no more than 140 MPa (21,000 psi). The material has an elongation (stretch before ultimate failure) of 9–10%. As is the case for all 7075 aluminum alloys, 7075-0 is highly corrosion-resistant combined with generally acceptable strength profile.

7075-T6 edit

T6 temper 7075 has an ultimate tensile strength of 510–540 MPa (74,000–78,000 psi) and yield strength of at least 430–480 MPa (63,000–69,000 psi). It has a failure elongation of 5–11%.[8]

The T6 temper is usually achieved by homogenizing the cast 7075 at 450 °C for several hours, quenching, and then ageing at 120 °C for 24 hours. This yields the peak strength of the 7075 alloys. The strength is derived mainly from finely dispersed eta and eta' precipitates both within grains and along grain boundaries.[9]

7075-T651 edit

T651 temper 7075 has an ultimate tensile strength of 570 MPa (83,000 psi) and yield strength of 500 MPa (73,000 psi). It has a failure elongation of 3–9%. These properties can change depending on the form of material used. The thicker plates may exhibit lower strengths and elongation than the numbers listed above.

7075-T7 edit

T7 temper has an ultimate tensile strength of 505 MPa (73,200 psi) and a yield strength of 435 MPa (63,100 psi). It has a failure elongation of 13%.[10] T7 temper is achieved by overaging (meaning aging past the peak hardness) the material. This is often accomplished by aging at 100–120 °C for several hours and then at 160–180 °C for 24 hours or more. The T7 temper produces a microstructure of mostly eta precipitates. In contrast to the T6 temper, these eta particles are much larger and prefer growth along the grain boundaries. This reduces the susceptibility to stress corrosion cracking. T7 temper is equivalent to T73 temper.[9]

7075-RRA edit

The retrogression and reage (RRA) temper is a multistage heat treatment temper. Starting with a sheet in the T6 temper, it involves overaging past peak hardness (T6 temper) to near the T7 temper. A subsequent reaging at 120 °C for 24 hours returns the hardness and strength to or very nearly to T6 temper levels.[9]

RRA treatments can be accomplished with many different procedures. The general guidelines are retrogressing between 180 and 240 °C for 15 min 10 s.[11]

Equivalent materials edit

Table of equivalent materials[12]
US ISO European Union Germany Japan Australia China
Standard AISI (UNS) Standard Designation Standard Numerical (Chemical symbols) Standard Designation (Material number) Standard Grade Standard Designation Standard Grade
ASTM B209,

ASTM B210, ASTM B211, ASTM B221, AMS-QQ-A-225/9, AMS-QQ-A-200/11, AMS-QQ-A-250/12, AMS-WW-T-700/7

7075

(A97075)

ISO 209 AW-7075 EN 573-3 EN AW-7075

(EN AW-AlZn5,5MgCu)

DIN 1725-1 AlZnMgCu1,5 (3.4365) JIS H4000;

JIS H4040

7075 AS 2848.1,

AS/NZS 1734, AS/NZS 1865, AS/NZS 1866

7075 GB/T 3190;

GB/T 3880.2

7075

Uses edit

The world's first mass-production usage of the 7075 aluminum alloy was for the Mitsubishi A6M Zero fighter. The aircraft was known for its excellent maneuverability which was facilitated by the higher strength of 7075 compared to previous aluminum alloys.

7000 series alloys such as 7075 are often used in transport applications due to their high specific strength, including marine, automotive and aviation.[7][13] These same properties lead to its use in rock climbing equipment, bicycle components, inline-skating-frames and hang glider airframes are commonly made from 7075 aluminium alloy. Hobby-grade RC models commonly use 7075 and 6061 for chassis plates. 7075 is used in the manufacturing of M16 rifles for the U.S. military as well as AR-15 style rifles for the civilian market. In particular high-quality M16 rifle lower and upper receivers, as well as extension tubes, are typically made from 7075-T6 alloy. Desert Tactical Arms, SIG Sauer, and French armament company PGM use it for their precision rifles. It is also commonly used in shafts for lacrosse sticks, such as the STX sabre, and camping knife and fork sets. It is a common material used in competition yo-yos as well.

Another application for the 7075-series alloy has been in connecting rods used in drag racing engines.  Aluminum rods do not have the fatigue life of forged steel rods, but have less mass than their steel counterparts, resulting in lower mechanical stress during periods in which an engine is operated under full-throttle, high-RPM conditions.

It has also been the standard material for crankcase guards on off-road motorcycles.

Due to its high strength, low density, thermal properties, and its ability to be highly polished, 7075 is widely used in mold tool manufacturing. This alloy has been further refined into other 7000 series alloys for this application, namely 7050 and 7020.

Aerospace applications edit

7075 was used in the Space Shuttle SRB nozzles, and the external tank SRB beam in the Inter-tank section. The forward- and aft skirt as well as the Interstage of the S-II, the second stage of the Saturn V was made from 7075.[14]

Applications edit

  1. Aircraft fittings
  2. Gears and shafts
  3. Missile parts
  4. Regulating valve parts
  5. Worm gears
  6. Aerospace/defense applications
  7. Automotive
  8. Bicycle Chainrings
  9. Bicycle Gearboxes
  10. Archery equipment


Trade names edit

7075 has been sold under various trade names including Zicral, Ergal, and Fortal Constructal. Some 7000 series alloys sold under brand names for making molds include Alumec 79, Alumec 89, Contal, Certal, Alumould, and Hokotol.

See also edit

  1. Northwest Airlines Flight 421
  2. https://www.thomasnet.com/articles/metals-metal-products/all-about-7075-aluminum-properties-strength-and-uses/
  3. WHAT ARE THE DIFFERENCES BETWEEN 6061 AND 7075 ALUMINUM?
  4. 7075 Aluminum: Get to Know its Properties and Uses
  5. Properties of 7075 aluminum alloy 2018-10-16 at the Wayback Machine
  6. Properties of 7075 aluminum alloy
  7. 7075 aluminum
  8. [1]

References edit

  1. ^ Juan J. Valencia, Peter N. Quested, "Thermophysical Properties"
  2. ^ ASM Handbook Volume 2: Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, 1990 pp. 137–38
  3. ^ Yoshio, Baba."Extra super duralumin and successive aluminium alloys for aircraft." Journal of Japan Institute of Light Metals (Sumitomo Light Metal Ind. Ltd., Japan) (in Japanese), Volume 39, Issue 5, p. 378. Retrieved: 22 November 2015.
  4. ^ Yoshida, Hideo (2020). Shoeisha. ISBN 978-4-86693-295-8
  5. ^ Canadian Aeronautics and Space Journal, 1989 vol 35-36 p. 129
  6. ^ "7075 (AlZn5.5MgCu, 3.4365, 2L95, A97075) Aluminum :: MakeItFrom.com". www.makeitfrom.com. Retrieved 22 April 2018.
  7. ^ a b Alcoa 7075 data sheet 2013-08-29 at the Wayback Machine (PDF), accessed October 13, 2006
  8. ^ . asm.matweb.com. Archived from the original on 16 October 2018. Retrieved 22 April 2018.
  9. ^ a b c Park, J. K., and A. J. Ardell. "Microstructures of the Commercial 7075 AI Alloy in the T651 and T7 Tempers". Metall. Trans. A. 14A (1983): 1957. Print.
  10. ^ "ASM Material Data Sheet". asm.matweb.com. Retrieved 22 April 2018.
  11. ^ Cina, Baruch M. REDUCING THE SUSCEPTIBILITY OF ALLOYS, PARTICULARLY ALUMINIUM ALLOYS, TO STRESS CORROSION CRACKING. Israel Aircraft Industries Ltd., assignee. Patent 3856584. 24 Dec. 1974. Print.
  12. ^ "7075 Aluminum Alloy Properties, 7075-T6, T7351, T651". www.theworldmaterial.com. from the original on 2021-10-16.
  13. ^ T Hashimoto, S Jyogan (Showa Aluminium), K Nakata, Y G Kin and M Ushio (Osaka University): FSW joining of high strength Al alloy
  14. ^ McCutcheon, Kimble D. (3 August 2022). "U.S. Manned Rocket Propulsion Evolution Part 8.20: The Saturn V S-II".

Further reading edit

  • "Properties of Wrought Aluminum and Aluminum Alloys: 7075, Alclad 7075", Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, Vol. 2, ASM Handbook, ASM International, 1990, pp. 115–116.

External links edit

  • Aluminum 7075 Properties

January 01, 1970
7075, aluminium, alloy, aa7075, aluminium, alloy, with, zinc, primary, alloying, element, excellent, mechanical, properties, exhibits, good, ductility, high, strength, toughness, good, resistance, fatigue, more, susceptible, embrittlement, than, many, other, a. 7075 aluminium alloy AA7075 is an aluminium alloy with zinc as the primary alloying element It has excellent mechanical properties and exhibits good ductility high strength toughness and good resistance to fatigue It is more susceptible to embrittlement than many other aluminium alloys because of microsegregation but has significantly better corrosion resistance than the alloys from the 2000 series It is one of the most commonly used aluminium alloys for highly stressed structural applications and has been extensively used in aircraft structural parts 2 A7075 T6Physical propertiesDensity r 2 81 g cm3 0 102 lb cu in Mechanical propertiesYoung s modulus E 71 7 GPa 10 400 ksi Tensile strength st 572 MPa 83 0 ksi Elongation e at break11 Poisson s ratio n 0 33Hardness Rockwell87 HRBThermal propertiesMelting temperature Tm 477 C 891 F Thermal conductivity k 1 130 150 W m KLinear thermal expansion coefficient a 2 36 10 5 K 1Specific heat capacity c 714 8 J kg KElectrical propertiesVolume resistivity r 51 5 nOhm m 7075 aluminium alloy s composition roughly includes 5 6 6 1 zinc 2 1 2 5 magnesium 1 2 1 6 copper and less than a half percent of silicon iron manganese titanium chromium and other metals It is produced in many tempers some of which are 7075 0 7075 T6 7075 T651 The first 7075 was developed in secret by a Japanese company Sumitomo Metal in 1935 3 but reverse engineered by Alcoa in 1943 after examining a captured Japanese aircraft 4 7075 was standardized for aerospace use in 1945 5 7075 was eventually used for airframe production in the Imperial Japanese Navy Contents 1 Basic properties 2 Mechanical properties 2 1 7075 O 2 2 7075 T6 2 3 7075 T651 2 4 7075 T7 2 5 7075 RRA 3 Equivalent materials 4 Uses 4 1 Aerospace applications 4 2 Applications 5 Trade names 6 See also 7 References 8 Further reading 9 External linksBasic properties editAluminium 7075A has a density of 2 810 g cm3 6 Mechanical properties editThe mechanical properties of 7075 depend greatly on the tempering of the material 7 7075 O edit Un heat treated 7075 7075 0 temper has a maximum tensile strength of no more than 280 MPa 40 000 psi and maximum yield strength of no more than 140 MPa 21 000 psi The material has an elongation stretch before ultimate failure of 9 10 As is the case for all 7075 aluminum alloys 7075 0 is highly corrosion resistant combined with generally acceptable strength profile 7075 T6 edit T6 temper 7075 has an ultimate tensile strength of 510 540 MPa 74 000 78 000 psi and yield strength of at least 430 480 MPa 63 000 69 000 psi It has a failure elongation of 5 11 8 The T6 temper is usually achieved by homogenizing the cast 7075 at 450 C for several hours quenching and then ageing at 120 C for 24 hours This yields the peak strength of the 7075 alloys The strength is derived mainly from finely dispersed eta and eta precipitates both within grains and along grain boundaries 9 7075 T651 edit T651 temper 7075 has an ultimate tensile strength of 570 MPa 83 000 psi and yield strength of 500 MPa 73 000 psi It has a failure elongation of 3 9 These properties can change depending on the form of material used The thicker plates may exhibit lower strengths and elongation than the numbers listed above 7075 T7 edit T7 temper has an ultimate tensile strength of 505 MPa 73 200 psi and a yield strength of 435 MPa 63 100 psi It has a failure elongation of 13 10 T7 temper is achieved by overaging meaning aging past the peak hardness the material This is often accomplished by aging at 100 120 C for several hours and then at 160 180 C for 24 hours or more The T7 temper produces a microstructure of mostly eta precipitates In contrast to the T6 temper these eta particles are much larger and prefer growth along the grain boundaries This reduces the susceptibility to stress corrosion cracking T7 temper is equivalent to T73 temper 9 7075 RRA edit The retrogression and reage RRA temper is a multistage heat treatment temper Starting with a sheet in the T6 temper it involves overaging past peak hardness T6 temper to near the T7 temper A subsequent reaging at 120 C for 24 hours returns the hardness and strength to or very nearly to T6 temper levels 9 RRA treatments can be accomplished with many different procedures The general guidelines are retrogressing between 180 and 240 C for 15 min 10 s 11 Equivalent materials editTable of equivalent materials 12 US ISO European Union Germany Japan Australia China Standard AISI UNS Standard Designation Standard Numerical Chemical symbols Standard Designation Material number Standard Grade Standard Designation Standard Grade ASTM B209 ASTM B210 ASTM B211 ASTM B221 AMS QQ A 225 9 AMS QQ A 200 11 AMS QQ A 250 12 AMS WW T 700 7 7075 A97075 ISO 209 AW 7075 EN 573 3 EN AW 7075 EN AW AlZn5 5MgCu DIN 1725 1 AlZnMgCu1 5 3 4365 JIS H4000 JIS H4040 7075 AS 2848 1 AS NZS 1734 AS NZS 1865 AS NZS 1866 7075 GB T 3190 GB T 3880 2 7075Uses editThe world s first mass production usage of the 7075 aluminum alloy was for the Mitsubishi A6M Zero fighter The aircraft was known for its excellent maneuverability which was facilitated by the higher strength of 7075 compared to previous aluminum alloys 7000 series alloys such as 7075 are often used in transport applications due to their high specific strength including marine automotive and aviation 7 13 These same properties lead to its use in rock climbing equipment bicycle components inline skating frames and hang glider airframes are commonly made from 7075 aluminium alloy Hobby grade RC models commonly use 7075 and 6061 for chassis plates 7075 is used in the manufacturing of M16 rifles for the U S military as well as AR 15 style rifles for the civilian market In particular high quality M16 rifle lower and upper receivers as well as extension tubes are typically made from 7075 T6 alloy Desert Tactical Arms SIG Sauer and French armament company PGM use it for their precision rifles It is also commonly used in shafts for lacrosse sticks such as the STX sabre and camping knife and fork sets It is a common material used in competition yo yos as well Another application for the 7075 series alloy has been in connecting rods used in drag racing engines Aluminum rods do not have the fatigue life of forged steel rods but have less mass than their steel counterparts resulting in lower mechanical stress during periods in which an engine is operated under full throttle high RPM conditions It has also been the standard material for crankcase guards on off road motorcycles Due to its high strength low density thermal properties and its ability to be highly polished 7075 is widely used in mold tool manufacturing This alloy has been further refined into other 7000 series alloys for this application namely 7050 and 7020 Aerospace applications edit 7075 was used in the Space Shuttle SRB nozzles and the external tank SRB beam in the Inter tank section The forward and aft skirt as well as the Interstage of the S II the second stage of the Saturn V was made from 7075 14 Applications edit Aircraft fittings Gears and shafts Missile parts Regulating valve parts Worm gears Aerospace defense applications Automotive Bicycle Chainrings Bicycle Gearboxes Archery equipmentTrade names edit7075 has been sold under various trade names including Zicral Ergal and Fortal Constructal Some 7000 series alloys sold under brand names for making molds include Alumec 79 Alumec 89 Contal Certal Alumould and Hokotol See also editNorthwest Airlines Flight 421 https www thomasnet com articles metals metal products all about 7075 aluminum properties strength and uses WHAT ARE THE DIFFERENCES BETWEEN 6061 AND 7075 ALUMINUM 7075 Aluminum Get to Know its Properties and Uses Properties of 7075 aluminum alloy Archived 2018 10 16 at the Wayback Machine Properties of 7075 aluminum alloy 7075 aluminum 1 References edit Juan J Valencia Peter N Quested Thermophysical Properties ASM Handbook Volume 2 Properties and Selection Nonferrous Alloys and Special Purpose Materials 1990 pp 137 38 Yoshio Baba Extra super duralumin and successive aluminium alloys for aircraft Journal of Japan Institute of Light Metals Sumitomo Light Metal Ind Ltd Japan in Japanese Volume 39 Issue 5 p 378 Retrieved 22 November 2015 Yoshida Hideo 2020 Shoeisha ISBN 978 4 86693 295 8 Canadian Aeronautics and Space Journal 1989 vol 35 36 p 129 7075 AlZn5 5MgCu 3 4365 2L95 A97075 Aluminum MakeItFrom com www makeitfrom com Retrieved 22 April 2018 a b Alcoa 7075 data sheet Archived 2013 08 29 at the Wayback Machine PDF accessed October 13 2006 ASM Material Data Sheet asm matweb com Archived from the original on 16 October 2018 Retrieved 22 April 2018 a b c Park J K and A J Ardell Microstructures of the Commercial 7075 AI Alloy in the T651 and T7 Tempers Metall Trans A 14A 1983 1957 Print ASM Material Data Sheet asm matweb com Retrieved 22 April 2018 Cina Baruch M REDUCING THE SUSCEPTIBILITY OF ALLOYS PARTICULARLY ALUMINIUM ALLOYS TO STRESS CORROSION CRACKING Israel Aircraft Industries Ltd assignee Patent 3856584 24 Dec 1974 Print 7075 Aluminum Alloy Properties 7075 T6 T7351 T651 www theworldmaterial com Archived from the original on 2021 10 16 T Hashimoto S Jyogan Showa Aluminium K Nakata Y G Kin and M Ushio Osaka University FSW joining of high strength Al alloy McCutcheon Kimble D 3 August 2022 U S Manned Rocket Propulsion Evolution Part 8 20 The Saturn V S II Further reading edit Properties of Wrought Aluminum and Aluminum Alloys 7075 Alclad 7075 Properties and Selection Nonferrous Alloys and Special Purpose Materials Vol 2 ASM Handbook ASM International 1990 pp 115 116 External links editAluminum 7075 Properties Retrieved from https en wikipedia org w index php title 7075 aluminium alloy amp oldid 1224338310, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.