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<p>The microstructure, crystal structures, cold workability, and martensitic transformation temperatures of several Cu<sub>100-<i>x</i>-<i>y</i></sub>Mn<sub><i>x</i></sub>Al<sub><i>y</i></sub> (40 ≤ <i>x</i> ≤ 55; 10 ≤ <i>y</i> ≤ 13; at%) alloys were invetigated. For the first time, martensitic transformation was revealed in&#xa0;Mn-rich Cu–Mn–Al alloys. The surface relief of the martensite phase reversibly appeared and disappeared during cooling and heating, along with a&#xa0;small thermal hysteresis, implying a thermoelastic transformation. The crystal structures of the parent and martensite phases are B2 and 2M(BCT), respectively, with <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40830_2025_519_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="28" /> </InlineMediaObject> <EquationSource Format="TEX">\(c/a\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>c</mi> <mo stretchy="false">/</mo> <mi>a</mi> </mrow> </math></EquationSource> </InlineEquation> being approximately 1.35&#xa0;for the martensite. Cold workability improves with decreasing Al content, exhibiting a trend similar to that observed for previously reported Cu-rich Cu–Al–Mn shape memory alloys. The martensitic transformation temperatures decrease with increasing Al content and increase with increasing Mn content. These results are consistent with the stability trends of the parent body-centered cubic phase in the phase diagram at high temperatures. The shape memory effect with a recovery strain of 1.3% was observed in a 5.0% pre-stretched Cu<sub>39</sub>Mn<sub>50</sub>Al<sub>11</sub> (at%) sample. This alloy demonstrates moderate cold workability and cost-effectiveness, exhibiting potential as an alternative for conventional shape memory alloys in various applications.</p>

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Martensitic Transformation and Shape Memory Effect in Mn-Rich Cu–Mn–Al Alloys

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Tatsuya Ito,
  • Sheng Xu,
  • Xiao Xu,
  • Toshihiro Omori,
  • Ryosuke Kainuma

摘要

The microstructure, crystal structures, cold workability, and martensitic transformation temperatures of several Cu100-x-yMnxAly (40 ≤ x ≤ 55; 10 ≤ y ≤ 13; at%) alloys were invetigated. For the first time, martensitic transformation was revealed in Mn-rich Cu–Mn–Al alloys. The surface relief of the martensite phase reversibly appeared and disappeared during cooling and heating, along with a small thermal hysteresis, implying a thermoelastic transformation. The crystal structures of the parent and martensite phases are B2 and 2M(BCT), respectively, with \(c/a\) c / a being approximately 1.35 for the martensite. Cold workability improves with decreasing Al content, exhibiting a trend similar to that observed for previously reported Cu-rich Cu–Al–Mn shape memory alloys. The martensitic transformation temperatures decrease with increasing Al content and increase with increasing Mn content. These results are consistent with the stability trends of the parent body-centered cubic phase in the phase diagram at high temperatures. The shape memory effect with a recovery strain of 1.3% was observed in a 5.0% pre-stretched Cu39Mn50Al11 (at%) sample. This alloy demonstrates moderate cold workability and cost-effectiveness, exhibiting potential as an alternative for conventional shape memory alloys in various applications.