【摘要】 借助光学金相、示差热分析、振动样品磁强计和X-射线能谱分析等分析方法,研究Ga含量对Co41Ni32-Al27-xGax合金马氏体相变和Curie点的影响。研究结果表明:合金马氏体相变温度与Ga含量成正比,在1 573和1 623 K淬火时,x增加1,马氏体相变温度提高25 K,但Ga含量对Curie点影响不大;在1 573 K淬火时,具有高有序度的马氏体相比B2结构相的Curie点高32 K,说明结构有序度对Curie点影响较大;淬火温度升高会显著提高合金的马氏体相变温度和Curie点,当淬火温度从1 573 K升高到1 623 K时,马氏体相变温度升高43~69K,Curie点平均升高41 K;随着Ga含量的增加,合金的熔点降低,在1 623 K淬火时Co41Ni32Al18Ga9合金发生部分熔化。更多还原

【Abstract】 The influences of gallium concentration on martensitic transformation temperature and Curie point of Co₄₁Ni₃₂Al_27-xGa_x alloys were investigated by optical micrography,scanning electron microscopy,differential scanning calorimetry and vibrating sample magnetometer and energy dispersive X-ray detector.The results show that the martensitic transformation temperatures of Co₄₁Ni₃₂Al_27-xGa_x alloys are linearly increased with Ga content.An increase of 1% in Ga concentration can cause the martensitic transformation temperature to be increased by 25 K for alloys quenched at 1623 K or at 1573 K,respectively.The influence on Curie points of Co₄₁Ni₃₂-(Al_27-xGa_x) alloys is very small.However,the order degree of phase structure has great effects on Curie point.The Curie point of high ordered martensitic phase is higher than that of B2 structure phase by 32 K.Martensitic transformation temperatures increase by 4369 K and Curie points increase by 41 K when the quenched temperatures elevate from 1573 to 1623 K.The melting points of(Co₄₁Ni₃₂Al_27-xGa_x) alloys decrease with the increase of Ga concentration,resulting in the partial melted phenomena of Co₄₁Ni₃₂Al₁₈Ga₇ alloy quenched at 1623 K.更多还原