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<p>The study investigates a NiCrPd single-phase face-centered cubic (FCC) medium-entropy alloy (MEA) that demonstrates significantly superior strength compared to the extensively studied NiCoCr alloy across temperatures ranging from cryogenic (77&#xa0;K) to elevated temperatures (1073&#xa0;K). The alloy exhibits exceptional yield strength of over 700&#xa0;MPa at 77&#xa0;K and maintains approximately 580&#xa0;MPa at room temperature and 400&#xa0;MPa at 873&#xa0;K while maintaining substantial ductility (~ 0.35), representing significant improvements over comparable medium-entropy systems. The deformation mechanisms are highly temperature-dependent: mechanical twinning dominates at cryogenic temperatures due to reduced stacking fault energy (SFE), while dislocation slip becomes predominant at room and elevated temperatures, with systematic dislocation analysis identifying Burgers vectors of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\frac{1}{2}\)</EquationSource> </InlineEquation>[01<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\bar{1}\)</EquationSource> </InlineEquation>] and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:\frac{1}{2}\)</EquationSource> </InlineEquation>[101]. Theoretical calculations based on atomic size and modulus mismatch models accurately predict the experimental yield strength (582&#xa0;MPa predicted vs. 580&#xa0;MPa measured), validating the predictive capability for MEA design. These findings provide fundamental insights into structure–property relationships and temperature-dependent deformation mechanisms in advanced metallic materials.</p> Graphical Abstract <p></p>

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Superior Strength and Temperature-Dependent Deformation Mechanisms of NiCrPd Single-Phase Medium-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Meiling Liang,
  • Haoyan Meng,
  • Yanxin Li,
  • Jingbo Qiao,
  • Peter K. Liaw,
  • Yang Tong,
  • Shuying Chen,
  • Fanchao Meng

摘要

The study investigates a NiCrPd single-phase face-centered cubic (FCC) medium-entropy alloy (MEA) that demonstrates significantly superior strength compared to the extensively studied NiCoCr alloy across temperatures ranging from cryogenic (77 K) to elevated temperatures (1073 K). The alloy exhibits exceptional yield strength of over 700 MPa at 77 K and maintains approximately 580 MPa at room temperature and 400 MPa at 873 K while maintaining substantial ductility (~ 0.35), representing significant improvements over comparable medium-entropy systems. The deformation mechanisms are highly temperature-dependent: mechanical twinning dominates at cryogenic temperatures due to reduced stacking fault energy (SFE), while dislocation slip becomes predominant at room and elevated temperatures, with systematic dislocation analysis identifying Burgers vectors of \(\:\frac{1}{2}\) [01 \(\bar{1}\) ] and \(\:\frac{1}{2}\) [101]. Theoretical calculations based on atomic size and modulus mismatch models accurately predict the experimental yield strength (582 MPa predicted vs. 580 MPa measured), validating the predictive capability for MEA design. These findings provide fundamental insights into structure–property relationships and temperature-dependent deformation mechanisms in advanced metallic materials.

Graphical Abstract