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Effect of Zn and Mg content on microstructure and properties of Al-Zn-Mg-Cu high strength aluminum alloys

Dongfeng Li, Zhang Xin-ming, Shengdan Liu, Yin Bang-wen

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Abstract

Effect of Zn and Mg content on microstructure,aging hardening behavior and mechanical properties of Al-3Zn-4. 5Mg-1Cu、Al-4Zn-3. 5Mg-1Cu and Al-4. 5Zn-3. 5Mg-1Cu alloys was investigated by means of hardness testing,ambient temperature tensile testing,optical microscopy,scanning electron microscopy and transmission electron microscopy. The results show that Al-4. 5Zn-3. 5Mg-1Cu alloy exhibits the highest hardening effect after aging at 120 ℃ for 24 h,the hardness is about 183 HV3,tensile strength is about 617 MPa,yield strength is about 590 MPa and ductility is about 10. 2%. The increase of Zn content or Zn / Mg ratio results in a higher density of hardening precipitates with a smaller size,and therefore better hardening effect.

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What this paper is about

Effect of Zn and Mg content on microstructure,aging hardening behavior and mechanical properties of Al-3Zn-4. 5Mg-1Cu、Al-4Zn-3. 5Mg-1Cu and Al-4. 5Zn-3. 5Mg-1Cu alloys was investigated by means of hardness testing,ambient temperature tensile testing,optical microscopy,scanning electron microscopy and transmission electron microscopy. The results show that Al-4. 5Zn-3. 5Mg-1Cu alloy exhibits the highest hardening effect after aging at 120 ℃ for 24 h,the hardness is about 183 HV3,tensile strength is about 617 MPa,yield strength is about 590 MPa and ductility is about 10. 2%. The increase of Zn content or Zn / Mg ratio results in a higher density of hardening precipitates with a smaller size,and therefore better hardening effect.

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Available abstract

Effect of Zn and Mg content on microstructure,aging hardening behavior and mechanical properties of Al-3Zn-4. 5Mg-1Cu、Al-4Zn-3. 5Mg-1Cu and Al-4. 5Zn-3. 5Mg-1Cu alloys was investigated by means of hardness testing,ambient temperature tensile testing,optical microscopy,scanning electron microscopy and transmission electron microscopy. The results show that Al-4. 5Zn-3. 5Mg-1Cu alloy exhibits the highest hardening effect after aging at 120 ℃ for 24 h,the hardness is about 183 HV3,tensile strength is about 617 MPa,yield strength is about 590 MPa and ductility is about 10. 2%. The increase of Zn content or Zn / Mg ratio results in a higher density of hardening precipitates with a smaller size,and therefore better hardening effect.

Key concepts: Materials science, Microstructure, Ultimate tensile strength, Alloy, Scanning electron microscope, Hardening (computing), Metallurgy, Aluminium

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Effect of Zn and Mg content on microstructure and properties of Al-Zn-Mg-Cu high strength aluminum alloys — Research Paper | ScholarLens