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2010•Hunan Nonferrous MetalsRequires access

Effect of Aging Treatment of Al-Zn-Cu-Mg-Sc-Zr Alloy on Microstructure and Properties

Pan Qing-lin

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Abstract

The microstructures and properties of Al-Zn-Cu-Mg-Sc-Zr alloy after different aging treatments were studied by means of O.M,TEM observation,hardness test and tensile test at room-temperature.The results show that the alloy has the character of aging hardening,the peak hardness arrives earlier after increasing aging temperature.The proper artificial aging treatment of the studied alloy is 120 ℃/24 h.At this condition,tensile strength,yield strength,elongation and hardness were 696 MPa,654 MPa,11.1% and 211.2 HV,respectively.The main strengthening phase is GP zone and phase,which lead to precipitation strengthening and dispersion strengthening.Al3Sc and Al3(Sc,Zr) particles performed well thermo stability;the property of retarding transgranular corrosion is improved with prolonging aging time.

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What this paper is about

The microstructures and properties of Al-Zn-Cu-Mg-Sc-Zr alloy after different aging treatments were studied by means of O.M,TEM observation,hardness test and tensile test at room-temperature.The results show that the alloy has the character of aging hardening,the peak hardness arrives earlier after increasing aging temperature.The proper artificial aging treatment of the studied alloy is 120 ℃/24 h.At this condition,tensile strength,yield strength,elongation and hardness were 696 MPa,654 MPa,11.1% and 211.2 HV,respectively.The main strengthening phase is GP zone and phase,which lead to precipitation strengthening and dispersion strengthening.Al3Sc and Al3(Sc,Zr) particles performed well thermo stability;the property of retarding transgranular corrosion is improved with prolonging aging time.

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Available abstract

The microstructures and properties of Al-Zn-Cu-Mg-Sc-Zr alloy after different aging treatments were studied by means of O.M,TEM observation,hardness test and tensile test at room-temperature.The results show that the alloy has the character of aging hardening,the peak hardness arrives earlier after increasing aging temperature.The proper artificial aging treatment of the studied alloy is 120 ℃/24 h.At this condition,tensile strength,yield strength,elongation and hardness were 696 MPa,654 MPa,11.1% and 211.2 HV,respectively.The main strengthening phase is GP zone and phase,which lead to precipitation strengthening and dispersion strengthening.Al3Sc and Al3(Sc,Zr) particles performed well thermo stability;the property of retarding transgranular corrosion is improved with prolonging aging time.

Key concepts: Materials science, Alloy, Microstructure, Precipitation hardening, Ultimate tensile strength, Metallurgy, Elongation, Precipitation

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Effect of Aging Treatment of Al-Zn-Cu-Mg-Sc-Zr Alloy on Microstructure and Properties — Research Paper | ScholarLens