2012•Light MetalsRequires access
Effect of aging treatment of Al-Zn-Cu-Mg-Sc-Zr alloy on microstructures and properties
Liang Zou
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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 showed that the alloy had the character of aging hardening,the peak hardness arrived earlier after increasing aging temperature.The proper artificial aging treatment of the studied alloy was 120℃24h.At this condition,tensile strength,yield strength,elongation and hardness were 696N/mm2,654N/mm2,11.1% and 211.2HV,respectively.The main strengthening phase was GP zone and η′phase,which leaded to precipitation strengthening and dispersion strengthening.Al3Sc and Al3(Sc,Zr) particles performed well thermo stability;the property of retarding transgranular corrosion was improved with prolonging aging time.