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MEA 含量对激光增材制造 Ti-MEA 合金 显微组织和力学性能的影响
Influence of the MEA Content on the Microstructure and Mechanical Properties of Ti-MEA Alloy Fabricated by Laser Additive Manufacturing
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- DOI:
- 作者:
- 何秋菊 1，成 瑶 1，2，黄信德 1，罗 旋 1
HE Qiuju1, CHENG Yao1,2, HUANG Xinde1, LUO Xuan1
- 作者单位:
- 1. 南京工业大学 先进轻质高性能材料研究中心，江苏，南京 210009；2. 长三角先进材料研究院，江苏 苏州 215132
1.Key Laboratory for Lightweight Materials, Nanjing Tech University, Nanjing 210009, China; 2. Materials Academy, JITRI, Suzhou 215132, China
- 关键词:
- Ti-MEA 合金；选择性激光熔化；显微组织；力学性能；晶粒细化
Ti-MEA alloy; selective laser melting; microstructure; mechanical properties; grain refinement
- 摘要:
- 纯钛在众多领域应用广泛， 但强度与耐磨性不足。 采用激光选区熔化技术， 制备不同 CoCrNi 中熵合金(MEA)含量(0.5%、1%和 2%，质量分数)的 Ti-xMEA 合金，探究 MEA 含量对其显微组织及力学性能的影响。 结果表明，添加 MEA 后，合金形成 α 马氏体与 Ni2Ti 析出相的复合组织，前 β 晶粒由柱状晶转化为等轴晶，α 马氏体显著细化；随MEA 含量增加，合金强度持续提升。 特别是 Ti-2MEA 合金与纯 Ti 相比屈服强度从 484 MPa 提升至 624 MPa，抗拉强度从 585 MPa 提升至 765 MPa，伸长率仍保持 13.3%，实现更优强度-塑性匹配。 细晶强化、固溶强化与 Ni2Ti 析出强化的协同作用，是合金性能提升的主要机制。
Puretitanium is widely used in many fields but suffers from insufficient hardness and wear resistance. Ti-xMEA alloys with different CoCrNi medium-entropy alloy (MEA) contents (0.5 wt.%, 1 wt.%, and 2 wt.%) were prepared by selective laser melting to investigate the effects of the MEA content on their microstructures and mechanical properties. The results show that after MEA is added, the alloy forms a composite structure of α martensite and Ni2Ti precipitated phases, the prior β grains transform from columnar grains to equiaxed grains, and the α martensite is significantly refined. With increasing MEA content, the strength of the alloy increases continuously. In particular, compared with that of pure Ti, the yield strength of the Ti-2MEA alloy increases from 484 MPa to 624 MPa, and the ultimate tensile strength increases from 585 MPa to 765 MPa, whereas the elongation remains at 13.3%, indicating better synergy between strength and plasticity. The synergistic effect of grain refinement strengthening, solid solution strengthening and Ni2Ti precipitation strengthening is the main mechanism underlying the improvement in the properties of the alloy.