Effects of solution treatment on microstructure and properties of Ti-5.7Al-3.9Sn-0.91Mo-3.4Zr-0.40Si-0.38Nb-0.95Ta titanium alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-10-22 DOI:10.1016/j.msea.2024.147439

Wentao Chen , Shuaijun Huang , Kehuan Wang , Zehua Wen , Jie Zhao , Gang Liu

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引用次数: 0

Abstract

This study investigated the effects of solution treatments under various conditions on the matrix and silicides microstructure and their impact on the mechanical properties of high-temperature Ti60 (Ti-5.7Al-3.9Sn-0.91Mo-3.4Zr-0.40Si-0.38Nb-0.95Ta) titanium alloy. The microstructure evolution during solution treatments was characterized, and the tensile properties at 600 °C and room temperature (RT) were investigated. The results show that the fraction and grain size of martensite and silicides can be tailored through solution treatments. With increasing solution temperature, the fraction of primary α (α_p) phase and silicides decreases, while that of the transformed β (β_t) microstructure increases. After solution treatment at 1025 °C, the yield strength (YS) and ultimate tensile strength (UTS) reach 685.0 MPa and 900.8 MPa, respectively, at 600 °C, increasing by 18.0 % and 27.0 %, respectively, compared to the initial state. The elongation (EL) remains at 16.2 %. The strengthening mechanisms of Ti60 alloy include grain boundary strengthening of the α_p phase and martensite formed during rapid cooling, as well as precipitation strengthening of the silicides. With increasing solution temperature from 950 °C to 1025 °C, the fraction of martensite strengthening increases from 38.4 % to 89.3 %, while the fraction of precipitation strengthening of silicides decreases from 3.63 % to 1.17 %.

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固溶处理对 Ti-5.7Al-3.9Sn-0.91Mo-3.4Zr-0.40Si-0.38Nb-0.95Ta 钛合金微观结构和性能的影响

本研究探讨了不同条件下的固溶处理对高温 Ti60（Ti-5.7Al-3.9Sn-0.91Mo-3.4Zr-0.40Si-0.38Nb-0.95Ta）钛合金基体和硅化物微观结构的影响及其对机械性能的影响。对固溶处理过程中的微观结构演变进行了表征，并研究了 600 °C 和室温（RT）下的拉伸性能。结果表明，马氏体和硅化物的比例和晶粒大小可通过固溶处理进行调整。随着固溶温度的升高，原生α（αp）相和硅化物的比例降低，而转化β（βt）微观结构的比例升高。在 1025 °C 下进行固溶处理后，600 °C 时的屈服强度（YS）和极限拉伸强度（UTS）分别达到 685.0 MPa 和 900.8 MPa，与初始状态相比分别提高了 18.0 % 和 27.0 %。伸长率 (EL) 保持在 16.2%。Ti60 合金的强化机制包括快速冷却过程中形成的 αp 相和马氏体的晶界强化，以及硅化物的沉淀强化。随着溶液温度从 950 °C 增加到 1025 °C，马氏体强化的比例从 38.4 % 增加到 89.3 %，而硅化物沉淀强化的比例从 3.63 % 降低到 1.17 %。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.