Sb添加对(β+γ)双相Co-Ni-Al形状记忆合金马氏体相变和磁性的影响  

INFLUENCE OF Sb ADDITION ON MARTENSITIC AND MAGNETIC TRANSFORMATIONS OF (β+γ) TWO-PHASE Co-Ni-Al SHAPE MEMORY ALLOY

作　　者：罗丰华[1] 陈嘉砚[2] 刘浪飞[1] 及川胜成[3] 石田清仁[3] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]钢铁研究总院结构材料研究所,北京100081 [3]日本东北大学工学部材料科学系

出　　处：《金属学报》2006年第8期785-791,共7页Acta Metallurgica Sinica

基　　金：教育部留学回国人员科研启动基金资助项目

摘　　要：利用OM,SEM,EDX,XRD,DSC和VSM研究了用Sb替代Al对Co_(41)Ni_(32)Al_(27)合金马氏体相变和磁性的影响．结果表明Co_(41)Ni_(32)Al_(26)Sb_1合金仍然生成L1_0型马氏体,其马氏体相变温度和Curie点与淬火温度成正比关系,淬火温度每升高10K,马氏体相变温度约提高9K,而Curie点约提高7．5K．相同淬火温度下Co_(41)Ni_(32)Al_(26)Sb_1合金的马氏体相变温度比Co_(41)Ni_(32)Al_(27)合金约高70 K,而Curie点也高出15 K．Co_(41)Ni_(32)Al_(26)Sb_1在1623 K热处理时出现共晶组织,发生部分熔化现象．特别重要的是Co_(41)Ni_(32)Al_(26)Sb_1合金的马氏体相变温度范围大幅度缩小,为20—28 K,只有Co_(41)Ni_(32)Al_(27)合金的一半,有利于获得大磁致应变．用平均s+d总电子浓度和平均磁价电子数分别解释了马氏体相变温度和Curie点的变化．Influence of 170 Sb （atomic fraction） addition in the Co41Ni32Al27 alloy on martensitic transformation and Curie temperature of the alloy was investigated by OM, SEM, EDX, XRD, DSC and VSM methods. The results show that the crystal structure of martensitic in Co41Ni32Al26Sb1 alloy is Llo type, as the same as the Co41Ni32Al27. Both martensitic transformation temperature Tm and Curie temperature Tc are linear relation to quenching temperature. Tm increased 9 K and Tc increased 7.5 K for every 10 K increasing in quenching temperature. Quenched from same temperature, Tm of CoalNi32A126Sbl alloy is higher than that of CoalNi32A127 alloy by 70 K, meanwhile Tc is higher by 15 K. The melting temperature of Co-Ni-A1 alloy decreased by the addition of Sb, eutectic structure appeared in Co41Ni32Al26Sb1 alloy quenched at 1623 K, indicating that the alloy was partially melted. The martensitic transformation temperature range of Co41Ni32Al26Sb1 alloy is 20-28 K, less than half that of Co41Ni32Al27 alloy. This is a very important result to benefit the achievement of large magnetic field induced strain on Co-Ni-Al based alloy. The results of Tm and Tc were explained by total average s＋d electron concentration and magnetic valence number, Zm separately.

关 键 词：Co—Ni—Al—Sb合金 马氏体相变 CURIE点 

分 类 号：TG139.6[一般工业技术—材料科学与工程]