研究不同应变和应变率下 Mo-14Re 合金的热变形行为和微观结构演变

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-14 DOI:10.1016/j.jmrt.2024.09.094
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引用次数: 0

摘要

本研究考察了 Mo-14Re 合金在 1400K 温度下不同真实应变(15%、35%、65%)和应变率(0.01 s-1、10 s-1)条件下的热变形行为。研究结果表明,在 0.01 s-1 的低应变速率下,随着应变的增加,动态恢复(DRV)和动态再结晶(DRX)同时发生,其中 DRV 是最主要的软化机制。当应变达到 65% 时,DRX 成为主要的软化过程。相反,在 10 s-1 的高应变速率下,DRX 受到抑制,Mo-14Re 合金因位错密度增加而发生加工硬化。显微分析表明,在低应变速率下,高密度位错有利于再结晶晶粒的继续成核和生长。在高应变速率下,纠结的位错阻碍了位错运动和再结晶。在纹理演变方面,在 0.01 s-1 的低应变速率下观察到较强的 {100}//CD 和较弱的 {111}//CD 纤维纹理,而在 10 s-1 的高应变速率下观察到较强的 {111}//CD 和较弱的 {100}//CD 纤维纹理,并且纹理强度增强。机理分析证实,{110}<111>、{112}<111>和{123}<111>位错滑移体系在高温下被激活,其中{123}<111>体系最为主要。
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Investigating the hot deformation behavior and microstructural evolution of Mo-14Re alloy at various strains and strain rates

This study examines the hot deformation behavior of Mo-14Re alloy at various true strains (15%, 35%, 65%) and strain rates (0.01 s−1, 10 s−1) at a temperature of 1400K. The findings indicate that dynamic recovery (DRV) and dynamic recrystallization (DRX) occur concomitantly as strain increases at a low strain rate of 0.01 s−1, with DRV being the predominant softening mechanism. At a strain of 65%, DRX emerges as the primary softening process. Conversely, under high strain rates of 10 s−1, DRX is inhibited, and the Mo-14Re alloy experiences work hardening due to an increase in dislocation density. Microscopic analysis shows that the high-density dislocations facilitate the continued nucleation and growth of recrystallized grains at low strain rates. At high strain rates, tangled dislocations hinder dislocation motion and recrystallization. Regarding texture evolution, stronger {100}//CD and weaker {111}//CD fiber texture is observed at low strain rates of 0.01 s−1, while stronger {111}//CD and weaker {100}//CD fiber texture forms at high strain rates of 10 s−1, with enhanced texture intensity. Mechanistic analysis confirms the activation of the {110}<111>, {112}<111>, and {123}<111> dislocation slip systems at elevated temperatures, with the {123}<111> system being the most dominant.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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