CAJ | 학술논문

详细地研究了Ni56Mn25-xCrxGa19(x=0, 2, 4, 6)合金的微观组织结构、马氏体相变特性、力学性能及形状记忆效应.结果表明:当x=0时,合金呈现出单一的四方结构马氏体相;当x≥2时,合金的微观组织为包含马氏体相和γ相的双相结构;随着Cr元素的增加,合金的马氏体相变温度逐渐降低,其峰值温度从x=0时的401 ℃降低到x=6时的197 ℃.热轧和拉伸试验表明:通过添加Cr元素在合金微观组织中引入γ相可有效地提高合金的热加工性能和塑性,x≥4的合金可通过常规热轧得到表面状态良好的1 mm厚的片材,合金的拉伸应力和应变在x=4和6时分别为497 MPa,8%和454 MPa,5.5%;x=4的合金在残余应变为4.5%时可得到2.7%的形状记忆回复,而x=6的合金在残余应变为3.5%时的可回复应变为1.9%.
상세지연구료Ni56Mn25-xCrxGa19(x=0, 2, 4, 6)합금적미관조직결구、마씨체상변특성、역학성능급형상기억효응.결과표명:당x=0시,합금정현출단일적사방결구마씨체상;당x≥2시,합금적미관조직위포함마씨체상화γ상적쌍상결구;수착Cr원소적증가,합금적마씨체상변온도축점강저,기봉치온도종x=0시적401 ℃강저도x=6시적197 ℃.열알화랍신시험표명:통과첨가Cr원소재합금미관조직중인입γ상가유효지제고합금적열가공성능화소성,x≥4적합금가통과상규열알득도표면상태량호적1 mm후적편재,합금적랍신응력화응변재x=4화6시분별위497 MPa,8%화454 MPa,5.5%;x=4적합금재잔여응변위4.5%시가득도2.7%적형상기억회복,이x=6적합금재잔여응변위3.5%시적가회복응변위1.9%.
The microstructure, martensitic transformation behavior, mechanical and shape memory properties of Ni56Mn25-xCrxGa19 (x=0, 2, 4, 6) alloys were investigated. Single phase of martensite with tetragonal structure is present for x=0, and dual-phase containing martensite and γ phase is observed for x≥2. The martensitic transformation peak temperatures decrease monotonically from 401 ℃ for x=0 to 197 ℃ for x=6. The introduction of γ phase by Cr addition is proved to be effective in improving the workability and ductility. The tensile stress and strain are 497 MPa and 8 % for x=4, and 454 MPa and 5.5 % for x=6, respectively. The shape memory strain values are 2.7 % under a residual strain of 4.5 % for x=4, and 1.9 % under a residual strain of 3.5 % for x=6, respectively.