Microstructure and mechanical properties stability of pre-hardening treatment in Al-Cu alloys for pre-hardening forming process

作     者：Liping Tang Pengfei Wei Zhili Hu Qiu Pang Liping Tang;Pengfei Wei;Zhili Hu;Qiu Pang

作者机构：Hubei Longzhong laboratoryXiangyang 441000China Hubei Key Laboratory of Advanced Technology for Automotive ComponentsSchool of Automotive EngineeringWuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center for Green&Precision Material FormingWuhan University of TechnologyWuhan 430070China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of EducationSchool of Machinery and AutomationWuhan University of Science and TechnologyWuhan 430081China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2024年第31卷第3期

页      面：539-551页

核心收录：

学科分类：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）] 

基　　金：supported by the National Natural Science Foundation of China (Nos.52075400 and 52275368) the 111 Project (No.B17034) the Key Research and Development Program of Hubei Province,China (Nos.2021BAA200 and 2022AAA001) the Independent Innovation Projects of the Hubei Longzhong Laboratory (No.2022ZZ-04) 

主　　题：Al-Cu alloy pre-hardened alloy natural aging mechanical properties microstructure 

摘      要：The stability of the microstructure and mechanical properties of the pre-hardened sheets during the pre-hardening forming(PHF)process directly determines the quality of the formed *** microstructure stability of the pre-hardened sheets was in-vestigated by differential scanning calorimetry(DSC),transmission electron microscopy(TEM),and small angle X-ray scattering(SAXS),while the mechanical properties and formability were analyzed through uniaxial tensile tests and formability *** results in-dicate that the mechanical properties of the pre-hardened alloys exhibited negligible changes after experiencing 1-month natural aging(NA).The deviations of ultimate tensile strength(UTS),yield strength(YS),and sheet formability(Erichsen value)are all less than 2%.Also,after different NA time(from 48 h to 1 month)is applied to alloys before pre-hardening treatment,the pre-hardened alloys possess stable microstructure and mechanical properties as ***,with the extension of NA time before pre-hardening treatment from 48 h to 1 month,the contribution of NA to the pre-hardening treatment is *** a yield strength increment of 20 MPa is achieved,with no loss in *** limited enhancement is mainly attributed to the fact that only a limited number of clusters are transformed into Guinier-Preston(GP)zones at the early stage of pre-hardening treatment,and the formation ofθ phase inhibits the nucleation and growth of GP zones as the precipitated phase evolves.