Superplastic behavior of a metastable β-type Ti alloy governed by grain size: Microstructure evolution and underlying deformation mechanism

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-09-05 DOI:10.1016/j.msea.2024.147212

Wenjing Zhang , Kai Wang , Xiaonan Qi , Huihong Liu , Ang Li , Hua Ding , Hidetoshi Fujii , Wei Liu

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Abstract

The superplastic forming (SPF) technology has gained widespread adoption in the manufacturing of intricately shaped components made from Ti alloys with high dimensional accuracy due to its near net forming capabilities. It is crucial to systematically investigate the superplastic behavior in metastable β-type Ti alloys. However, the microstructure evolution and underlying superplastic deformation mechanism governed by grain size in these alloys remain unclear. In this study, three types of fine-grained (<10 μm) Ti-15V-3Cr-3Sn-3Al (Ti-15-3) alloys were obtained using friction stir processing (FSP), and tensile tests were conducted at temperature of 650 °C with strain rates ranging from 1 × 10⁻⁴ s⁻¹ to 3 × 10⁻³ s⁻¹. The deformation behavior of the coarse-grained (>3 μm) Ti-15-3 alloy can be described as quasi-superplastic rather than strictly superplastic. In this microstructure, plasticity is synergistically contributed by grain boundary sliding (GBS), continuous dynamic recrystallization (CDRX), and dynamic phase transformation (DPT). For the fine-grained (<3 μm) Ti-15-3 alloy, deformation enters into the superplastic region with GBS becoming the predominant deformation mechanism accompanied by DPT. Additionally, strain/stress promotes α phase precipitation from the β matrix, which inhibits grain growth and serves as a supplementary stress accommodation mechanism facilitating continuous operation of GBS and ultimately achieving exceptional superplasticity.

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受晶粒尺寸制约的可代谢β型钛合金的超塑性行为：显微结构演变和基本变形机制

超塑性成形（SPF）技术因其近净成形能力，已被广泛应用于用钛合金制造具有高尺寸精度的复杂形状部件。系统研究可蜕变β型钛合金的超塑性行为至关重要。然而，这些合金的微观结构演变和受晶粒尺寸制约的潜在超塑性变形机制仍不清楚。本研究利用摩擦搅拌加工（FSP）获得了三种细晶粒（<10 μm）Ti-15V-3Cr-3Sn-3Al（Ti-15-3）合金，并在温度为 650 ℃、应变速率为 1 × 10-4 s-1 至 3 × 10-3 s-1 的条件下进行了拉伸试验。粗晶粒（>3 μm）Ti-15-3合金的变形行为可描述为准超塑而非严格的超塑。在这种微结构中，塑性是由晶界滑动（GBS）、连续动态再结晶（CDRX）和动态相变（DPT）协同作用产生的。对于细晶粒（<3 μm）的 Ti-15-3 合金，变形进入超塑性区，GBS 成为主要的变形机制，同时伴有 DPT。此外，应变/应力会促进 α 相从 β 基体中析出，从而抑制晶粒长大，并作为一种补充应力容纳机制，促进 GBS 的持续运行，最终实现优异的超塑性。

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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.