Investigation of the Peculiar Stress Flow Behavior of a Novel TiAl Alloy under High Strain Rate Conditions

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ji-Sung Park, Min-Sik Kim, Jong-Woo Won, Seong-Woong Kim, Seong-Hoon Yi
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引用次数: 0

Abstract

In this study, we investigated the peculiar flow behavior during the isothermal deformation of a novel TiAl composition at 1200 °C and 1300 °C under high strain rate conditions using Gleeble® Thermal-Mechanical Simulators. The initial yield-point phenomenon, resembling strain hardening at both temperatures, is attributed to the remnant lamellar microstructure. Secondary hardening at 1200 ℃ is caused by dislocation accumulation at the grain boundaries of the α phase, without the formation of dynamically recrystallized γ lamellar grains. In-grain misorientation axes analysis revealed a shift in the dominant deformation slip mode of the α phase from the prismatic slip system to a combined prismatic and basal slip system. The disappearance of γ lamellar laths after the first strain hardening and during secondary hardening is likely initiated by a deformation-induced γ→α phase transition within the γ phase matrix by the extended dislocation with intrinsic stacking faults and occurred simultaneously in the whole γ lamellae.

Graphical Abstract

一种新型TiAl合金在高应变率条件下的特殊应力流动行为研究
在这项研究中,我们使用Gleeble®热机械模拟器研究了一种新型TiAl成分在1200°C和1300°C高应变率条件下的等温变形过程中的特殊流动行为。两种温度下的初始屈服点现象,类似于应变硬化,是由残余的片层组织引起的。1200℃时的二次硬化是由α相晶界处的位错积累引起的,没有形成动态再结晶的γ层状晶粒。晶内错取向轴分析表明,α相的主要变形滑移模式由棱柱滑移系统转变为棱柱和基底滑移组合系统。在第一次应变硬化后和二次硬化过程中,γ片层板条的消失可能是由变形引起的γ相基体内的γ→α相变引起的,这一相变在整个γ片层中同时发生。图形抽象
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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
期刊介绍: Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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