Phase evolution and mechanical properties of AlxCrTaTi refractory medium entropy alloys

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2024-11-20 DOI:10.1016/j.vacuum.2024.113847

Xiangxing Xiao , Jiadong Wen , Kechuan Wei , Xian Wang , Xingdong Zhao , Xingqiang Wang , Guixue Zhang , Ying Xu , Yan Wei , Hualong Ge , Hongzhong Cai , Xuehang Wang , Li Chen , Junmei Guo , Kunhua Zhang , Changyi Hu

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Abstract

In multi-principal refractory alloys (high-entropy alloys, medium-entropy alloys), the presence of the second phase has an important influence on the mechanical properties of the alloys. In this paper, AlxCrTaTi (x = 0, 0.25, 0.5, 1.0) refractory medium-entropy alloys were prepared by vacuum arc melting method, and the microstructure, density, and mechanical properties were investigated. The CrTaTi alloy consists of BCC dendritic and C15 Laves phases, whereas the Al_xCrTaTi alloys consist of a two-phase eutectic organization (BCC phase and C14 Laves phase). With the increase of Al content, the content of the second phase increases from 15.97 % to 42.19 %, resulting in an increase in the yield strength of the alloy from 1491 MPa to 2354 MPa at 25 °C, and from 253 MPa to 426 MPa at 1000 °C. The addition of Al element changes the enthalpy, elemental distribution, and solidification process of the alloy, resulting in the formation of Cr-rich and Ti-rich two-phase eutectic organizations in the alloy. With the increase of Al, the second phase strengthening is the main reason for the enhancement of alloy properties.

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AlxCrTaTi 难熔中熵合金的相变和机械性能

在多本征难熔合金（高熵合金、中熵合金）中，第二相的存在对合金的力学性能有重要影响。本文采用真空电弧熔炼法制备了 AlxCrTaTi（x = 0、0.25、0.5、1.0）难熔中熵合金，并对其显微组织、密度和力学性能进行了研究。CrTaTi 合金由 BCC 树枝状相和 C15 Laves 相组成，而 AlxCrTaTi 合金则由两相共晶组织（BCC 相和 C14 Laves 相）组成。随着铝含量的增加，第二相的含量从 15.97 % 增加到 42.19 %，从而使合金在 25 °C 时的屈服强度从 1491 兆帕增加到 2354 兆帕，在 1000 °C 时的屈服强度从 253 兆帕增加到 426 兆帕。铝元素的加入改变了合金的焓、元素分布和凝固过程，使合金中形成了富铬和富钛的两相共晶组织。随着铝元素的增加，第二相强化是合金性能增强的主要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.