Origin of non-uniform plasticity in a high-strength Al-Mn-Sc based alloy produced by laser powder b e d fusion

被引:38
作者
Bayoumy, Dina [1 ,2 ]
Kwak, Kwangsik [3 ]
Boll, Torben [4 ]
Dietrich, Stefan [5 ]
Schliephake, Daniel [5 ]
Huang, Jie [6 ]
Yi, Junlan [6 ]
Takashima, Kazuki [3 ]
Wu, Xinhua [1 ,2 ]
Zhu, Yuman [1 ,2 ]
Huang, Aijun [1 ,2 ]
机构
[1] Monash Ctr Addit Mfg, 15-17 Normanby Rd, Notting Hill, Vic 3168, Australia
[2] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[3] Kumamoto Univ, Dept Mat Sci & Engn, Chuo Ku, 2-39-1 Kurokami, Kumamoto 8608555, Japan
[4] Karlsruhe Inst Technol KIT, Karlsruhe Nano Micro Facil KNMF, Hermann Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[5] Karlsruhe Inst Technol KIT, Inst Appl Mat IAM WK, Engelbert Arnold Str 4, D-76131 Karlsruhe, Germany
[6] Shanghai Aircraft Mfg Co Ltd, Aeronaut Mfg Technol Inst, Shanghai 201324, Peoples R China
来源
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2022年 / 103卷
基金
澳大利亚研究理事会;
关键词
Aluminium alloy; Laser powder bed fusion; Crystal plasticity; Microstructures; Strengthening; ULTRAFINE-GRAINED ALUMINUM; MECHANICAL-PROPERTIES; MG ALLOY; ZR ALLOY; PRECIPITATION; DEFORMATION; MICROSTRUCTURE; BEHAVIOR; TRANSITION; PARTICLES;
D O I
10.1016/j.jmst.2021.06.042
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The Al-Mn-Sc-based alloys specific for additive manufacturing (AM) have been recently developed and can reach ultrahigh strength and adequate elongation. However, these alloys commonly exhibit nonuniform plasticity during tensile deformation, which is a critical issue hindering their wider application. In this work, the origin of this non-uniform plasticity of the alloys produced by laser powder bed fusion (LPBF) has been systematically investigated for the first time. The results show that the loss of uniform plasticity in the alloy originates from microstructural regions containing equiaxed fine-grains (FGs) ( -650 nm in size) at the bottom of the melt pools. In micro-tensile tests, the strength of these FG regions can reach a peak of -630 MPa. After this, an apparent yield drop occurs, followed by rapid strain softening. This FG behavior is associated with intermetallic particles along grain boundaries and a lack of uniform mobile dislocations during deformation. The columnar coarse-grain (CG) regions in the remaining melt pools show uniform plasticity and moderate work hardening. Furthermore, the quantitative calculations indicate that the solid solution strengthening in these two regions is similar. Nevertheless, secondary Al 3 Sc precipitates contribute to -260 MPa strength in the FG, compared to 310 MPa in the CG due to their different number density. In addition, grain boundary strengthening can reach 230 MPa in the FG region; nearly double the CG region value. ?? 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:121 / 133
页数:13
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