Heat Treatment Optimization for a High Strength Al-Mn-Sc Alloy Fabricated by Selective Laser Melting

被引：6
作者：
Liu, Hongyu [1 ]
Zhang, Hao [2 ]
Meng, Liju [1 ]
Li, Yulong [2 ]
Cao, Sheng [1 ]
机构：
[1] Shantou Univ, Coll Engn, Dept Mech Engn, Shantou 515063, Peoples R China
[2] Beijing Univ Technol, Fac Mat & Mfg, Beijing 100080, Peoples R China
来源：
MATERIALS | 2023年 / 16卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Al-Mn-Sc alloy; selective laser melting; heat treatment; high strength; precipitation hardening; MICROSTRUCTURE; AMBIENT; PHASE;
D O I：
10.3390/ma16114054
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A selective laser-melted Al-Mn-Sc alloy with 99.9% relative density has been obtained in this work through systematic process optimization. The as-fabricated specimen had the lowest hardness and strength, but the highest ductility. The aging response has shown that 300 degrees C/5 h is the peak aged condition, and it had the highest hardness, yield strength, ultimate tensile strength, and elongation at fracture. Such a high strength was attributed to the uniformly distributed nano-sized secondary Al3Sc precipitates. A further increase in aging temperature to 400 degrees C resulted in an over-aged condition, which contained a reduced volume fraction of secondary Al3Sc precipitates and resulted in a reduced strength.
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页数：13
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