热旋压及时效处理TC11钛合金的组织与性能

doi:10.13251/j.issn.0254-6051.2025.07.009

摘要/Abstract

摘要： 通过SEM、TEM、硬度及拉伸测试等分析方法研究了TC11钛合金热旋压成形及时效后的微观组织、硬度及拉伸断口形貌和微区成分。结果表明,TC11钛合金经热旋压后,α相和β相组织均明显被拉长,时效后组织形貌无差异,而析出相组成不同,热旋压后有Al₃Ti、Si₃Ti₂Zr₃等析出相,时效后有Al₃Ti、TiZr、Ti₂Zr、Si₃Ti₂Zr₃等析出相。TC11钛合金α相的硬度略大于β相,热旋压后的综合硬度较原始双重退火态提升20%,再经时效后的综合硬度较原始双重退火态提升22%,即时效处理后的综合硬度略大于热旋压态,热旋压对TC11钛合金的硬度影响最大。TC11钛合金时效后的拉伸断口为混合型断口,α相含较多Al、具有硬脆性且不易变形,其断口微区呈解理断裂特征,而β相含有较多Mo,具有一定程度的延性,其断口微区形貌上含较多撕裂棱,且在初生β相区中存在α相的解理断裂。

关键词: 热旋压, 钛合金, 时效, 微观组织, 断口形貌, 性能

Abstract: Microstructure, hardness, morphology and composition of tensile fracture of TC11 titanium alloy after hot spinning and aging were studied by means of SEM, TEM and hardness and tensile test. The results show that the microstructure of the TC11 titanium alloy after hot spinning contains α phase and β phase which are obviously elongated, and there is no difference in micro morphology after aging, while the precipitates are different. There are precipitates such as Al₃Ti and Si₃Ti₂Zr₃ after hot spinning, and precipitates such as Al₃Ti, TiZr, Ti₂Zr and Si₃Ti₂Zr₃ after aging. The hardness of α phase in the TC11 titanium alloy is slightly higher than that of β phase, the overall hardness after hot spinning is 20% higher than that of the original double-annealing state, and the overall hardness after followed aging is 22% higher than that of the original double-annealing state, that is, the hardness after aging is slightly higher than that after hot spinning, and hot spinning has the greatest influence on the hardness of the TC11 titanium alloy. The tensile fracture of the TC11 titanium alloy after aging is mixed fracture. The α phase where shows cleavage fracture characteristics contains more Al, which is hard and brittle and is not easy to deformation, while the phase β where shows more tearing edges in fracture contains more Mo and has a certain degree of ductility, and there is cleavage fracture of precipitated α phase in the primary β phase region.

Key words: hot spinning, titanium alloy, aging, microstructure, fracture morphology, properties

中图分类号:

TG156.99

白鹭, 张小娟, 周钟平, 李睿, 朱立坚, 王军喜. 热旋压及时效处理TC11钛合金的组织与性能[J]. 金属热处理, 2025, 50(7): 61-65.

Bai Lu, Zhang Xiaojuan, Zhou Zhongping, Li Rui, Zhu Lijian, Wang Junxi. Microstructure and properties of TC11 titanium alloy by hot spinning and aging[J]. Heat Treatment of Metals, 2025, 50(7): 61-65.

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