NiMnGa基高温形状记忆合金的制备与表征的中期报告

NiMnGa基高温形状记忆合金的制备与表征的中期报告摘要NiMnGa基高温形状记忆合金具有优良的形状记忆效应和超弹性效应，在高温环境下应用潜力很大。本研究采用真空熔炼-热处理工艺制备了Ni50Mn28

NiMnGa 基高温形状记忆合金的制备与表征的中期报 告 摘要 NiMnGa基高温形状记忆合金具有优良的形状记忆效应和超弹性效 应，在高温环境下应用潜力很大。本研究采用真空熔炼-热处理工艺制备 了Ni50Mn28Ga22和Ni50Mn26Ga24两种高温形状记忆合金，并对 其进行了微观结构、力学性能和形状记忆效应的研究。结果表明， Ni50Mn28Ga22和Ni50Mn26Ga24均能够展示出明显的高温形状记忆 效应和超弹性效应，且两种合金的记忆温度相差不大。此外， Ni50Mn28Ga22的应力-应变曲线较为典型，而Ni50Mn26Ga24的塑 性略高，但仍具有较好的超弹性效应。该研究的结果有助于深入理解 NiMnGa基高温形状记忆合金的性能与结构关系，为其在高温环境下的 应用提供参考。 关键词： NiMnGa，高温形状记忆合金，超弹性，塑性，微观结构 Abstract NiMnGa-basedhigh-temperatureshapememoryalloyshave excellentshapememoryandsuperelasticeffects,andhavegreat potentialinhigh-temperatureapplications.Inthisstudy, Ni50Mn28Ga22andNi50Mn26Ga24high-temperatureshape memoryalloyswerepreparedbyvacuummelting-heattreatment process,andtheirmicrostructure,mechanicalpropertiesand shapememoryeffectswerestudied.Theresultsshowedthatboth Ni50Mn28Ga22andNi50Mn26Ga24exhibitedsignificant high-temperatureshapememoryandsuperelasticeffects,andthe memorytemperatureofthetwoalloysdidnotdiffersignificantly. Inaddition,thestress-straincurveofNi50Mn28Ga22wasmore typical,whiletheplasticityofNi50Mn26Ga24wasslightlyhigher butstillexhibitedgoodsuperelasticeffect.Theresultsofthis studycanhelptofurtherunderstandtherelationshipbetweenthe performanceandstructureofNiMnGa-basedhigh-temperature