Ti对Zr-Nb二元合金β结构稳定性和力学性能的影响

doi:10.11900/0412.1961.2020.00125

金属学报

2021, Vol. 57

Issue (1): 95-102 DOI: 10.11900/0412.1961.2020.00125

研究论文

本期目录 | 过刊浏览

Ti对Zr-Nb二元合金β结构稳定性和力学性能的影响

王明康¹, 苑峻豪¹, 刘宇峰², 王清¹(

), 董闯¹, 张中伟³

^1.大连理工大学材料科学与工程学院三束材料改性教育部重点实验室大连 116024
^2.航天材料及工艺研究所先进功能复合材料技术重点实验室北京 100076
^3.北京理工大学先进结构技术研究院北京 100081

Effect of Ti on β Structural Stability and Mechanical Properties of Zr-Nb Binary Alloys

WANG Mingkang¹, YUAN Junhao¹, LIU Yufeng², WANG Qing¹(

), DONG Chuang¹, ZHANG Zhongwei³

^1.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
^2.Science and Technology of Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China
^3.Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

引用本文:

王明康, 苑峻豪, 刘宇峰, 王清, 董闯, 张中伟. Ti对Zr-Nb二元合金β结构稳定性和力学性能的影响[J]. 金属学报, 2021, 57(1): 95-102.
Mingkang WANG, Junhao YUAN, Yufeng LIU, Qing WANG, Chuang DONG, Zhongwei ZHANG. Effect of Ti on β Structural Stability and Mechanical Properties of Zr-Nb Binary Alloys[J]. Acta Metall Sin, 2021, 57(1): 95-102.

全文: PDF(47442 KB) HTML

摘要:

利用团簇成分式方法设计了[Zr-Zr₁₄](Zr, Nb)₃系列二元合金，进而采用Ti替代部分Zr形成三元合金；采用真空铜模吸铸快冷技术制备合金棒材，利用XRD、OM、TEM等对其进行微观组织表征和力学性能测试。结果表明，随着Nb含量增加，Zr-Nb二元合金基体结构从hcp-α向bcc-β转变，β结构稳定的同时伴随有ω相析出。适量Ti添加可显著抑制ω相的析出，进一步改善了合金的β结构稳定性。其中，单相bcc-β合金[Ti-Zr₁₄]Nb₃ (Zr-17.37Nb-2.98Ti，质量分数，%)表现出低弹性模量(E=57 GPa)的同时具有最佳的力学性能(屈服强度σ_YS=557 MPa、延伸率δ=15.5%)。

关键词 ： Zr-Nb-Ti合金, 结构稳定性, 团簇成分式, 弹性模量, 力学性能

Abstract：

Metastable bcc β-Zr alloys generally have low elastic modulus, magnetic susceptibility, good mechanical properties, corrosion resistance, and biocompatibility, which are ascribed to co-alloying of multiple elements to enhance the structural stability of the bcc-β phase. This work systematically investigated the effects of Nb and Ti elements on the structural stability of the bcc-β phase and mechanical properties of Zr-Nb-Ti alloys. Various binary [Zr-Zr₁₄](Zr, Nb)₃ alloy compositions were designed by the cluster formula approach, based on which Ti was substituted for the base Zr to form ternary alloys. Alloy rods were prepared by the copper-mold suction-cast method with vacuum protection. The microstructure and mechanical properties of the alloys were characterized using XRD, OM, and TEM etc. The results show that the crystal structures of the Zr-Nb binary alloys could change from hcp-α to bcc-β with increasing Nb content, whereas, the ω-phase always coexists with the β-phase. An appropriate amount of Ti addition can significantly inhibit the precipitation of ω, resulting in the further improvement of the stability of the β-phase. The single β-[Ti-Zr₁₄]Nb₃ (Zr-17.37Nb-2.98Ti, mass fraction, %) ternary alloy exhibited not only a low elastic modulus of E=57 GPa but also a good tensile property with a high yield strength of σ_YS=557 MPa and an elongation of δ=15.5%.

Key words： Zr-Nb-Ti alloy structural stability cluster formula approach elastic modulus mechanical property

收稿日期: 2020-04-20

ZTFLH:

TG146.414

基金资助:国家重点研发计划项目(2017YFB0702401);国家自然科学基金项目(91860108);辽宁省自然科学基金项目(2019-KF-05-01)

作者简介: 王明康，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00125 或 https://www.ams.org.cn/CN/Y2021/V57/I1/95

图1 系列合金的XRD谱和典型合金的OM像

图2 [Zr-Zr14](Zr, Nb)3系列合金的TEM明场(BF)和暗场(DF)像及其对应的SAED花样

图3 [Ti-Zr14](Ti, Nb)3系列合金的TEM明场和暗场像及其对应的SAED 花样

图4 系列合金的工程应力-应变拉伸曲线

表1 设计系列合金的相组成及力学性能

图5 系列合金弹性模量以及硬度、强度和延伸率随Nbeq和相组成的变化

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