晶粒尺寸和温度对纳米晶tial合金塑性变形及强化机理的影响

IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Baocheng Zhou, Hui Cao, Zhiyuan Rui, Ruicheng Feng
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引用次数: 0

摘要

数十年来,TiAl合金因其高比强度和高模量而引起了国内外的广泛关注。然而,在日益苛刻的使用环境中,其强度,特别是高温强度需要进一步提高。表面纳米化已被证明是提高材料强度的有效途径。本文采用分子动力学方法研究了纳米晶γ-TiAl (NC-γ-TiAl)合金在室温和高温下力学行为的影响。在室温和高温条件下,屈服应力随晶粒尺寸的减小而减小,表现出逆Hall-Petch行为,流变应力随晶粒尺寸的增大先增大后减小。室温下,与肖克利部分位错相关的本征层错和外源层错以及变形孪晶都对塑性有影响,而部分位错的变形孪晶和交叉滑移除了在纳米晶中具有晶界强化作用外,还具有额外的强化作用。当温度上升到1000 K时,只发现一些本征层错和大量的Frenkel缺陷,这应该是导致高温强度低得多的原因。本文的研究结果有助于理解NC-γ-TiAl合金在高温应用下的强化机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Grain size and temperature dependent plastic deformation and strengthening mechanism of nano-crystalline tial alloy

TiAl alloy has attracted abroad interests for decades because of its high specific strength and high modulus. However, the strength, especially high-temperature strength needs to be further improved in an increasingly demanding service environment. Surface nano-crystallization has been proved to be an effective route for improving the strength of a material. In this work, molecular dynamics (MD) simulations are applied to study the effect of grain size on the mechanical behaviors of nano-crystallized γ-TiAl (NC-γ-TiAl) alloy under room temperature and high temperatures. It’s found that the yield stress decreases with the decreasing of grain size, exhibiting the so-called inverse Hall-Petch behavior, and the flow stress increases firstly and then decreases with the increase of grain size under room and high temperatures. At room temperature, all the intrinsic stacking faults and extrinsic stacking faults, associated with Shockley partial dislocations, and deformation twins contribute to the plasticity, and the deformation twinning and cross slip of partial dislocations can provide additional strengthening effects except for the grain boundary strengthening effect in nano-crystalline. When the temperature rises to 1000 K, only some intrinsic stacking faults and a large number of Frenkel defects are found, which should be responsible for the much lower high-temperature strength. The results obtained in this work should be helpful for understanding the underlying strengthening mechanism of NC-γ-TiAl alloy under the aim of high temperature applications.

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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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