摘要：The martensitic transformation,mechanical,and magnetic properties of the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) (x=0.125,0.25,0.375,0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5)[(x=0.125,y=0.125,0.25,0.375,0.5) and (x=0.125,0.25,0.375,y=0.625)]alloys were systematically studied by the first-principles *** the formation energy,the martensite is smaller than the austenite,the Ni–(Co)–Mn–Cu–Ti alloys studied in this work can undergo martensitic *** austenite and non-modulated (NM) martensite always present antiferromagnetic state in the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) (y<0.625) *** y=0.625 in the Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) series,the austenite presents ferromagnetic state while the NM martensite shows antiferromagnetic *** doping can decrease the thermal hysteresis and anisotropy of the Ni–(Co)–Mn–Ti *** Mn and decreasing Ti content can improve the shear resistance and normal stress resistance,but reduce the toughness in the Ni–Mn–Cu–Ti *** the ductility of the Co–Cu co-doping alloy is inferior to that of the Ni–Mn–Cu–Ti and Ni–Co–Mn–Ti *** electronic density of states was studied to reveal the essence of the mechanical and magnetic properties.

摘要：Heusler型磁相变合金是一类新型智能材料,能够在外加磁场下发生相变,从而产生磁致形状记忆效应、磁超弹性、磁热效应、磁阻效应等多功能特性,作为传感、驱动和固态制冷材料在航空航天、国防、能源等领域具有广阔的应用前景.此类合金的晶体结构、磁结构和多场耦合下的相变对其功能特性具有重要影响.中子散射技术为Heusler型磁相变合金的晶体结构、磁结构和晶格动力学研究提供了独特的条件,原位中子散射和同步辐射高能X射线衍射技术为多场耦合下的磁-结构相变研究提供了理想的工具.本文综述了基于先进中子散射技术和同步辐射技术对Heusler型磁相变合金晶体结构、磁结构和外场耦合下相变的原位研究,以及基于这些先进原位表征的合金高性能设计,以期能为将来高性能磁相变材料的设计和研制提供借鉴.