α″纳米孪晶型改进α + β钛合金的力学性能

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-04-19 DOI:10.1016/j.scriptamat.2025.116717

Yandi Jia , Yingjie Ma , Shujun Li , Hao Wang , Song Chen , Yujing Yang , Qian Wang , Sensen Huang , Min Qi , Jiafeng Lei , Rui Yang

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引用次数: 0

摘要

采用Ti-3Al-5Mo-4.5 V （wt. %, α + β）合金，首次研究了α + α″共存组织中α″纳米孪晶在不同时效温度下的演变及其对力学性能的影响。结果表明，在低温时效过程中，形成{111}α″型Ⅰ纳米孪晶以适应α″晶格应变。随着时效温度从300℃升高到350℃，I型纳米孪晶的数量比例和面积比例均增加。在350°C时效处理的样品中，相对丰富的纳米孪晶明显阻碍了应力诱导的<；211>；α″型Ⅱ孪晶转变的发生，从而提高了屈服强度。该研究为开发具有优异强度/延展性的新型钛合金提供了重要见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Improving the mechanical properties of α + β titanium alloys by tailoring α″ nanotwins variants

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Improving the mechanical properties of α + β titanium alloys by tailoring α″ nanotwins variants

We employ Ti-3Al-5Mo-4.5 V (wt. %, α + β) alloy to investigate, for the first time, the evolution of α″ nanotwins at different aging temperatures in an α + α″ coexisting microstructure, as well as their influence on mechanical properties. The results demonstrate that {111}_α″ type Ⅰ nanotwins form to accommodate α″ lattice strain during low-temperature aging. Both the number proportion and area proportion of the type I nanotwins increase as the aging temperature rises from 300 °C to 350 °C. The relatively abundant pre-existing nanotwins in the samples aged at 350 °C significantly hinder the occurrence of stress-induced <211>_α″ type Ⅱ twinning transformation, leading to enhanced yield strength. This study provides critical insights into developing new Ti-alloys with superior strength/ductility.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.