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

• 作者: Chong Yang Pengming Cheng Baoan Chen Jinyu Zhang Gang Liu Jun Sun
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2022,（1）
• 页码范围: 325-331
• 页数: 7页
• 语种: 英文

摘要

Sc solute clusters with a high number density were produced in an Al-0.3 wt.％Sc alloy when aged at 250 ℃,while fine Al3Sc 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 ductil-ity than its counterpart strengthened by Al3Sc precipitates.This clearly demonstrates a superior strength-ductility synergy promoted by the Sc solute clusters in Al-Sc alloys.The effects of Al3Sc 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 resis-tance.