Pt−10Ir贵重合金的流动行为及动态软化机理

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2025-01-01 Epub Date: 2025-01-23 DOI:10.1016/S1003-6326(24)66676-8

Xin-pei ZHANG , Jun-jie HE , Lin PI , Quan FU , Wen-yan ZHOU , Jun CHENG , Sheng-wen BAI , Xuan ZHOU , Yi LIU , Yong MAO

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引用次数: 0

摘要

研究了Pt−10Ir合金在多种变形参数下的热变形行为。在低变形温度（950 ~ 1150℃）下，软化机制以动态恢复为主。此外，晶界附近渐进晶格旋转的动态再结晶（lrgb辅助的DRX）和微剪切带辅助的动态再结晶（MSBs辅助的DRX）协调了变形。然而，由于DRXed晶粒数量有限，动态软化很难抵消染色硬化。在高变形温度（1250 ~ 1350°C）下，与应变率相关的DRX机制主要有三种：lrgb DRX、均匀性取向增加DRX （HIM）和几何DRX （GDRX）。随着应变的增加，高应变率下LRGBs的DRX逐渐增强；在低应变速率下，“掐断”效应增强，有利于形成均匀细腻的微观组织。

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Flow behavior and dynamic softening mechanism of Pt−10Ir precious alloy

The hot deformation behavior of Pt−10Ir alloy was studied under a wide range of deformation parameters. At a low deformation temperature (950−1150 °C), the softening mechanism is primarily dynamic recovery. In addition, dynamic recrystallization by progressive lattice rotation near grain boundaries (DRX by LRGBs) and microshear bands assisted dynamic recrystallization (MSBs assisted DRX) coordinate the deformation. However, it is difficult for the dynamic softening to offset the stain hardening due to a limited amount of DRXed grains. At a high deformation temperature (1250−1350 °C), three main DRX mechanisms associated with strain rates occur: DRX by LRGBs, DRX by a homogeneous increase in misorientation (HIM) and geometric DRX (GDRX). With increasing strain, DRX by LRGBs is enhanced gradually under high strain rates; the “pinch-off” effect is enhanced at low strain rates, which was conducive to the formation of a uniform and fine microstructure.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.