直轧细晶Ti-6Al-4V钛合金超塑性流动过程中空洞生长的模拟

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2022-02-23 DOI:10.1080/09500839.2022.2036380

Xin Wang, Ge Zhou, Chao Liu, Siqian Zhang, Haoyu Zhang, Feng Li, Lijia Chen

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引用次数: 4

摘要

摘要采用轧制方法制造了Ti–6Al–4V细晶板，然后在AG 250KNE电子拉伸试验机上进行了不同温度和应变速率下的超塑性拉伸试验。还测试了板材的超塑性行为。建立了空洞生长模型，预测了空洞生长过程中能量的变化规律和超塑性变形的微观组织演变。Ti–6Al–4V合金在840°C下的最大伸长率为886%，应变速率为5 × 10−4 s−1。该合金的应变速率敏感性指数m为0.54。建立了超塑变形机制为应变诱导晶界滑移，空穴生长机制为塑性控制的空穴聚结和生长。

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Modelling of cavity growth during the superplastic flow of a fine-grained Ti–6Al–4V titanium alloy processed by direct rolling

ABSTRACT Ti–6Al–4V fine-grained plates were manufactured using a rolling method and then subjected to superplastic tensile tests at varying temperatures and strain rates on an AG 250KNE electronic tensile testing machine. The superplastic behaviours of the plates were also tested. A cavity-growth model was established and the changing laws of energy during cavity growth and microstructure evolution of superplastic deformation were predicted. The Ti–6Al–4V alloy possessed the maximum elongation rate of 886% at 840°C and a strain rate of 5 × 10−4 s−1. The strain-rate sensitivity index m for this alloy was 0.54. The mechanism of superplastic deformation was established to be strain-induced grain-boundary slip, and the mechanism of cavity growth to be plasticity-controlled cavity coalescence and growth.

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.