Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti2VZrNb0.5Al0.5 high-entropy alloy

協同提高新型輕質Ti2VZrNb0.5Al0.5高熵合金抗氧化 性能與力學性能

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Zibing An
  • Shengcheng Mao
  • Yinong Liu
  • Yanhui Chen
  • Xiaomeng Yang
  • Shanshan Liu
  • Xin Wang
  • Qingsong Deng
  • Ze Zhang
  • Xiaodong Han

Detail(s)

Original languageEnglish
Pages (from-to)2842–2849
Number of pages8
Journal / PublicationScience China Materials
Volume65
Issue number10
Online published13 May 2022
Publication statusPublished - Oct 2022

Abstract

Enhanced oxidation resistance is a primary demand for the application of refractory high-entropy alloys (RHEAs) at elevated temperatures. In this study, Al was added to a Ti2VZrNb RHEA to partially substitute Nb to improve its oxidation resistance and mechanical properties. The alloy was found to have an increased oxidation resistance by forming a continuous Al2O3 + ZrO2 oxide protective surface. At the same time, the room-temperature yield strength was also increased by 66% to 1273 MPa via solid solution strengthening. The low atomic mass of Al also helped to reduce the density of the alloy by 8.2% to 5.44 g cm−3. This resulted in a high specific yield strength of 234 MPa cm3 g−1 for the alloy. Meanwhile, the Ti2VZrNb0.5Al0.5 alloy also exhibited a high compressive plasticity of >50%. These values are among the best reported so far for RHEAs.
提高抗氧化性能是難熔高熵合金高溫應用的首要要求. 本研究中, 我們將Al代替50%Nb添加到Ti2VZrNb難熔高熵合金中, 以提高其抗氧化性能與力學性能. 結果表明, 相比於Ti2VZrNb合金, Ti2VZrNb0.5-Al0.5合金的抗氧化性得到了顯著提升, 這是由於在合金表面形成了連續的Al2O3 + ZrO2氧化層保護膜. 同時, Ti2VZrNb0.5Al0.5合金室溫屈服強度高達1273 MPa, 相比於Ti2VZrNb合金強度提升66%. 結構表徵說明, Ti2VZrNb0.5Al0.5合金強度提升得益於其較大的固溶強化效果. 較輕元素Al的添加使得該合金具有較低的密度(5.44 g cm−3) , 相比於T i 2 V Z r N b 合金密度降低 8.2%, 這使得該合金的比強度高達234 MPa cm3 g−1. 同時, Ti2VZrNb0.5Al0.5合金也具有較高的壓縮塑性(>50%). 綜合這些結果, 該合金是迄今為止所報導的性能最好的難熔高熵合金.

Research Area(s)

  • high-entropy alloy, mechanical property, oxidation resistance, plasticity, strength

Citation Format(s)

Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti2VZrNb0.5Al0.5 high-entropy alloy. / An, Zibing; Mao, Shengcheng; Yang, Tao; Liu, Yinong; Chen, Yanhui; Yang, Xiaomeng; Liu, Shanshan; Wang, Xin; Deng, Qingsong; Zhang, Ze; Han, Xiaodong.

In: Science China Materials, Vol. 65, No. 10, 10.2022, p. 2842–2849.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review