Improving plasticity by Si-addition-induced coherent nanoprecipitates in Cu-Al-Mn alloy fabricated by laser powder bed fusion

被引:0
作者
Li, Ying [1 ]
Dang, Mingzhu [1 ,2 ]
Xiang, Honghao [2 ]
Hou, Yue [1 ]
Wei, Qingsong [2 ]
机构
[1] Naval Univ Engn, Coll Power Engn, Wuhan 430033, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 33卷
基金
中国国家自然科学基金;
关键词
Laser powder bed fusion; Shape memory alloy; Plasticity; Nanoprecipitates; Microstructure characterization; Tensile testing; SHAPE-MEMORY ALLOYS; MECHANICAL-PROPERTIES; MICROSTRUCTURE; SUPERELASTICITY; TRANSFORMATION; PHASE;
D O I
10.1016/j.jmrt.2024.09.035
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, the Cu-10.8Al-8.3Mn-0.37Si alloy containing Mn5Si3 phase was obtained by adding Si element to the Cu-10.8Al-8.3Mn alloy. The two alloys were printed by laser powder bed fusion. The changes in the organization and tensile properties of the alloys and the mechanism were investigated. After Si addition, the Mn5Si3 nano phase precipitated in the alloy in addition to the beta(1) austenite phase. The Mn5Si3 phase was co-lattice with the beta(1) phase with an average size of 10 nm and was diffusely distributed. Standard tensile experiments showed that the yield strength of the Cu-10.8Al-8.3Mn-0.37Si alloy decreased by 57.7% and the elongation increased by 266% compared to the Cu-10.8Al-8.3Mn alloy, while the tensile strength remained essentially unchanged. The presence of Mn5Si3 phase provided nucleation points for martensite and promoted the generation of stress-induced martensite. Hence the yield strength was reduced. TEM results showed that the beta(1) phase in the Cu-10.8Al-8.3Mn-0.37Si alloy was fully transformed into stress-induced martensite after deformation, which displayed the transformation induced plasticity effect and hindered the slip of dislocations. Meanwhile, the Mn5Si3 phase was sheared by the stacking faults, which promoted the accumulation of hetero-deformation-induced stress. Therefore, the hardening capacity and plasticity of the Cu-10.8Al-8.3Mn-0.37Si alloy were enhanced. This work provides a new idea for the plasticity enhancement of Cu-Al-Mn-based shape memory alloys achieved by co-lattice nano-precipitated phase strengthening.
引用
收藏
页码:70 / 78
页数:9
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