Solute clusters-promoted strength-ductility synergy in Al-Sc alloy  

作　　者：Chong Yang Pengming Cheng Baoan Chen Jinyu Zhang Gang Liu Jun Sun 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [2]State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute Co.,Ltd.,Beijing 102209,China

出　　处：《Journal of Materials Science & Technology》2022年第1期325-331,共7页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52071253,51621063,51625103,51722104 and 51790482);the“111 Project”of China(BP2018008);the Financial support by the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies。

摘　　要：Sc solute clusters with a high number density were produced in an Al-0.3 wt.%Sc alloy when aged at250℃,while fine Al_(3)Sc precipitates were predominantly formed in the same alloy aged at 300℃.The alloy strengthened by Sc solute clusters displayed higher yield strength and simultaneously greater ductility than its counterpart strengthened by Al_(3)Sc precipitates.This clearly demonstrates a superior strengthductility synergy promoted by the Sc solute clusters in Al-Sc alloys.The effects of Al_(3)Sc precipitates and Sc solute clusters on ductility were discussed in comparison by using a micromechanics fracture model.Since the Sc clusters were stabilized at 250℃,the Al-Sc alloys strengthened by Sc solute clusters should find extensive application fields within a wide temperature range,due to their high temperature resistance.

关 键 词：Al-Sc alloy Solute clusters STRENGTH DUCTILITY Micromechanics model 

分 类 号：TG146.21[一般工业技术—材料科学与工程]