Microstructure and martensitic transformation in quaternary NiTiHfV alloy

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-10-01 DOI:10.1016/S1003-6326(24)66608-2

Aleksandr V. SHUITCEV , Yi REN , Ze-zhong ZHANG , Roman N. VASIN , Bin SUN , Li LI , Yun-xiang TONG

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Abstract

The effect of age hardening on the microstructure, martensitic transformation behavior, and shape memory properties of the (Ni₅₀Ti₃₀Hf₂₀)₉₅V₅ alloy was investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, microhardness, and bending tests. The results demonstrate a significant influence of V addition on the microstructure of the alloy. V addition leads to the formation of a (Ni,V)₂(Ti,Hf)-type Laves phase, which coexists with B19‘ martensite at room temperature. Aging at 550 °C results in precipitation hardening due to the formation of nano-scale orthorhombic H-phase, with the peak hardness observed after 3 h of aging. The alloy at peak hardness state exhibits higher transformation strain and lower unrecovered strain compared to the solution-treated sample. The aged sample achieves a maximum transformation strain of 1.56% under 500 MPa.

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第四态 NiTiHfV 合金的显微组织和马氏体转变

通过扫描电子显微镜、透射电子显微镜、X 射线衍射、差示扫描量热、显微硬度和弯曲试验，研究了时效硬化对 (Ni50Ti30Hf20)95V5 合金的显微组织、马氏体转变行为和形状记忆性能的影响。结果表明，添加 V 对合金的微观结构有很大影响。添加 V 导致形成 (Ni,V)2(Ti,Hf) 型拉维斯相，在室温下与 B19' 马氏体共存。在 550 °C 下时效会导致纳米级正交 H 相形成沉淀硬化，时效 3 小时后可观察到峰值硬度。与溶液处理样品相比，处于硬度峰值状态的合金表现出更高的转化应变和更低的未恢复应变。老化样品在 500 兆帕下的最大变形应变为 1.56%。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.