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Cu-Al-Ni-Ti合金激光选区成形工艺及其力学性能

Selective Laser Melting Process and Mechanical Properties of Cu-Al-Ni-Ti Alloy

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摘要

基于激光选区熔化(SLM)工艺制备了一种具有高致密度、高强度和高硬度的Cu-13.5Al-4Ni-0.5Ti形状记忆合金试样。对试样的微观组织进行分析表征, 并研究了其在室温和300 ℃下的拉伸性能。结果表明:当激光能量密度约为110 J·mm-3时, 试样的相对密度最大, 超过99.5%; 试样微观组织中平行延伸的板条状马氏体横跨熔化道生长, 晶粒平均尺寸约为43 μm, 与铸造试样相比, 晶粒得到明显细化; 试样在常温下的抗拉强度为(541±26) MPa, 断后伸长率为(7.63±0.39)%; 在300 ℃下的抗拉强度提高至(611±9) MPa, 断后伸长率提高至(10.78±1.87)%, 该合金在高温领域具有一定的应用潜力。

Abstract

Copper-based shape memory alloys Cu-13.5Al-4Ni-0.5Ti with high relative density, high strength and high hardness are fabricated by selective laser melting (SLM). The microstructures are characterized and the tensile properties at room temperature and 300 ℃ are evaluated, respectively. The results show that the maximum relative density of 99.5% is obtained when the laser input energy is 110 J·mm-3. The lath martensite extending in parallel in the microstructure of the sample grows across the melting tracks and the average grain size is about 43 μm, The grain size of the SLM-fabricated sample is smaller than that of the casting sample. The average tensile strength and percentage elongation after fracture of the SLM-fabricated sample are (541±26) MPa and (7.63±0.39)% at room temperature, respectively, and the tensile strength is increased to (611±9) MPa at 300 ℃, and the percentage elongation after fracture is increased to (10.78±1.87)%. The SLM-fabricated alloy shows a good application potential in the high temperature fields.

Newport宣传-MKS新实验室计划
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中图分类号:TG146.1

DOI:10.3788/cjl201946.0302001

所属栏目:激光制造

基金项目:武汉市应用基础前沿项目(2018010401011281)、国家自然科学基金青年基金(51701078)、中国博士后基金面上项目(2018M632846)、湖北省教育厅科学研究计划指导性项目(B2016053)

收稿日期:2018-09-29

修改稿日期:2018-10-24

网络出版日期:2018-11-20

作者单位    点击查看

田健:华中科技大学材料成形与模具技术国家重点实验室, 湖北 武汉 430074
魏青松:华中科技大学材料成形与模具技术国家重点实验室, 湖北 武汉 430074
朱文志:华中科技大学材料成形与模具技术国家重点实验室, 湖北 武汉 430074
党明珠:华中科技大学材料成形与模具技术国家重点实验室, 湖北 武汉 430074
文世峰:华中科技大学材料成形与模具技术国家重点实验室, 湖北 武汉 430074

联系人作者:魏青松(wqs_xn@163.com); 朱文志(start919@126.com);

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引用该论文

Tian Jian,Wei Qingsong,Zhu Wenzhi,Dang Mingzhu,Wen Shifeng. Selective Laser Melting Process and Mechanical Properties of Cu-Al-Ni-Ti Alloy[J]. Chinese Journal of Lasers, 2019, 46(3): 0302001

田健,魏青松,朱文志,党明珠,文世峰. Cu-Al-Ni-Ti合金激光选区成形工艺及其力学性能[J]. 中国激光, 2019, 46(3): 0302001

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