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Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAPBased SIMA Process

作     者:Jin-Long Fu Hong-Jun Jiang Kai-Kun Wang 

作者机构:School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Wuxi Turbine Blade Co.LtdWuxi 214174JiangsuChina 

出 版 物:《Acta Metallurgica Sinica(English Letters)》 (金属学报(英文版))

年 卷 期:2018年第31卷第4期

页      面:337-350页

核心收录:

学科分类:080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基  金:supported financially by the National Natural Science Foundation of China(Nos.51174028 and 51541406) 

主  题:Semisolid Aluminum Equal-channel angular pressing Mierostructural evolution Tensileproperty 

摘      要:A modified strain-induced melt activation(SIMA)process consisting of homogenization,equal-channel angular pressing(ECAP)and subsequent heating to the semisolid temperatures was introduced to prepare the 7075 aluminum alloy with superior thixotropic *** effects of both the homogenization and the number of ECAP passes,as well as the isothermal temperatures on the microstructural evolution,were *** results indicate that ideal microstructure wherein fine and globular solid grains surrounded by uniform liquid films can be achieved through ECAP deformation-recrystallization *** the number of ECAP passes accelerates the recrystallization of strained grains,thus reducing the average grain size and improving the grain ***,higher holding temperatures and prolonged soaking time can improve the growth of the solid *** main coarsening mechanisms,*** and Ostwald ripening,contribute to the growth of the solid grains simultaneously and *** tensile strength of the 7075 alloys after four-pass ECAP-based SIMA and T6 heat treatment is relatively lower than the as-received billet,while the elongation of SIMA processed samples is much higher than that of as-received *** the number of ECAP passes improves the tensile strength for alloys with and without T6 treatment due to the fine grain strengthening mechanism.

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