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亚稳β型Ti-Nb-(Zr)合金的力学性能与微观结构研究

任抒琪，刘翠秀*,齐悦童，黄子坤，刘林林，孙 威*
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2023年 第42卷 第3期: 1000-6281（2023）03-291-08     下载地址：

亚稳β型Ti-Nb-(Zr)合金的力学性能与微观结构研究

任抒琪，刘翠秀*,齐悦童，黄子坤，刘林林，孙  威*

（北京工业大学 材料与制造学部固体微结构与性能研究所，北京100124）

摘  要 本文对亚稳β型Ti-26Nb-2Zr(at.%)、Ti-26Nb(at.%)、Ti-22Nb-4Zr(at.%)和Ti-18Nb-8Zr(at.%)合金的力学性能和微观结构进行了研究，并探讨了Zr元素的添加对Ti-Nb-Zr合金力学性能影响的作用机理。结果表明：添加Zr元素可以提高Ti-Nb-Zr合金的抗拉强度和塑性，但Zr元素替代相同原子比的Ti元素与替代相同原子比的Nb元素的作用机理不同。分析认为在一定原子比范围内，当Zr元素替代相同原子比的Ti元素时，合金的β相稳定性提高，Zr元素的添加对合金起到固溶强化的作用；而当Zr元素替代相同原子比的Nb元素时，随着Zr元素含量的增大、Nb元素含量的减少，合金的β相稳定性降低，塑性变形过程中应力诱发相变与变形孪晶易产生，合金的强度与塑性得到提高。Ti-Nb-(Zr)合金室温塑性变形过程中，{332}<113>变形孪晶起主导作用，在合金晶粒内部产生多种{332}<113>孪晶变体，不同孪晶变体之间会发生交互作用，为了进一步协调应力会在粗大的{332}<113>一次孪晶中形成{332}<113>二次孪晶。

关键词  亚稳β钛合金；室温拉伸变形；Zr添加；{332}<113>变形孪晶

中图分类号：TG146.2+3；O762；TG115.21+5.3  文献标识码：A  doi:10.3969/j.issn.1000-6281.2023.03.003

 

Study on mechanical properties and microstructure of metastable

β-type Ti-Nb-(Zr) alloys

REN Shu-qi，LIU Cui-xiu*，QI Yue-tong，HUANG Zi-kun，LIU Lin-lin，SUN Wei*

(Institute of Microstructure and Property of Advanced Materials，Faculty of Materials and Manufacturing，

Beijing University of Technology，Beijing 100124，China)

Abstract  In this paper, the mechanical properties and microstructure of metastable β-type Ti-26Nb-2Zr (at.%), Ti-26Nb (at.%), Ti-22Nb-4Zr (at.%) and Ti-18Nb-8Zr (at.%) alloys were studied. The mechanism of the effect of Zr element on the mechanical properties of Ti-Nb-Zr alloy was discussed. The results show that the addition of the Zr element can improve the tensile strength and the plasticity of Ti-Nb-Zr alloys. the mechanism of the Zr element replacing Ti element with the same atomic ratio is different from that of Nb element. When Zr element replaces Ti element with the same atomic ratio, the stability of beta phase is improved, and the addition of Zr element plays a role in solid solution strengthening of the alloy. When Zr element replaces Nb element with the same atomic ratio, the stability of beta phase is reduced with the increase of Zr element content and the decrease of Nb element content. Stress-induced phase transformation and deformation twins are easy to occur during plastic deformation, and the strength and plasticity of the alloy are improved. During the plastic deformation of Ti-Nb-(Zr) alloys at room temperature, the {332} <113> twins play a dominant role, and a variety of {332} <113> twin variants are generated inside the alloy grains. Different twin variants interact with each other. To further coordinate the stress, {332} <113> secondary twins are formed in the coarse primary {332} <113> twins.

Keywords   metastable β titanium alloy；room-temperature tensile deformation；Zr addition; {332}<113> deformation twinning

 

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