Design of ultrahigh strength Al-Zn-Mg-Cu alloys through a hybrid approach of high-throughput precipitation simulation and decisive experiment  

作　　者：Ya Li Xiaoyu Zheng Yuling Liu Yi Kong Shilin Zeng Bo Wang Ziqing Xie Qiang Du Namin Xiao Yong Du 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]School of Mathematics and Statistics,Hunan Normal University,Changsha 410081,China [3]SINTEF Industry,Oslo,Norway [4]Application Evaluation Center of Aeronautical and Engine Materials,Aecc Beijing Institute of Aeronautical Materials,Beijing 100095,China

出　　处：《Journal of Materials Science & Technology》2024年第28期234-247,共14页材料科学技术(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2018YFB0704003);the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China(No.51820105001).

摘　　要：The development of new engineering alloy chemistries and heat treatments is a time-consuming and iterative process.Here,a hybrid approach of the high-throughput precipitation simulations and decisive experiments is developed to optimize the composition and manipulate the microstructure of Al-Zn-Mg-Cu alloys to achieve the expected yield strength and elongation.For that purpose,a multi-class Kampmann-Wagner numerical(KWN)framework is established and the contributions to precipitation kinetics and strength from primary phases and precipitates formed before age hardening are introduced for the first time.The composition/process-structure-property relationship of Al-Zn-Mg-Cu alloys is pre-sented and discussed in detail.Coupled with thermodynamic calculations,two concentration-optimized Al-Zn-Mg-Cu alloys with expected high yield strength and long elongation are designed,prepared,and characterized.The excellent strength and elongation of the designed alloys and the good agreement between the measured and model-predicted mechanical properties for these two alloys underscores the remarkable predictive power of the presently developed material design strategy.This work establishes a novel material design strategy for rapidly exploring the compositional space and investigating the effects of composition and heat treatment on the microstructure and performance of ultrahigh strength Al alloys and other materials.

关 键 词：Materials design Al-Zn-Mg-Cu alloy Kampmann-Wagner numerical model Precipitation hardening simulation High-throughput calculation 

分 类 号：TG1[金属学及工艺—金属学]