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<p>The microstructures of both the as-cast and solution-treated Mg–30Sc alloy were systematically characterized. The tensile properties of the as-cast and solution-treated Mg–30Sc alloy were evaluated at ambient temperature. For the solution-treated alloy, deformation twins were suppressed, and dislocation slip was the dominant plastic deformation mechanism during tensile test. Pyramidal &lt; <i>c</i> + <i>a</i> &gt; dislocations with a large scale Burgers vector (<i>b</i> = 2 &lt; <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\overline{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>2</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation>205 &gt;) were detected in the alloy. The formation of these pyramidal &lt; <i>c</i> + <i>a</i> &gt; dislocations involves atomic shear displacement in both the &lt; 01<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\overline{1}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation>0 &gt; and &lt; 0001 &gt; directions. Compared with other Mg–RE alloys under the same condition, the Mg–30Sc alloy achieves a combination of high strength and good ductility due to the activation of large-scale pyramidal &lt; <i>c</i> + <i>a</i> &gt; dislocations.</p>

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Large-scale pyramidal < c + a > dislocations induced by atomic shear displacement

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Rui Zhang,
  • Qiaowang Chen,
  • Yixuan Jiang,
  • Li Li,
  • Zhongtao Jiang,
  • Wan Xiong,
  • Miaojin He

摘要

The microstructures of both the as-cast and solution-treated Mg–30Sc alloy were systematically characterized. The tensile properties of the as-cast and solution-treated Mg–30Sc alloy were evaluated at ambient temperature. For the solution-treated alloy, deformation twins were suppressed, and dislocation slip was the dominant plastic deformation mechanism during tensile test. Pyramidal < c + a > dislocations with a large scale Burgers vector (b = 2 <  \(\overline{2}\) 2 ¯ 205 >) were detected in the alloy. The formation of these pyramidal < c + a > dislocations involves atomic shear displacement in both the < 01 \(\overline{1}\) 1 ¯ 0 > and < 0001 > directions. Compared with other Mg–RE alloys under the same condition, the Mg–30Sc alloy achieves a combination of high strength and good ductility due to the activation of large-scale pyramidal < c + a > dislocations.