摘要
利用金相和SEM,XRD,DSC和VSM研究了Co含量x对Ni52Ga28Fe20-xCox合金马氏体相变和铁磁性的影响。结果表明:x≤6%时(原子分数,下同),Co代替Fe显著提高合金的马氏体相变温度,每1%Co可以使马氏体相变温度提高50K^60K,但对Curie点的影响不大。淬火温度从1423K降低到773K对马氏体相变温度的影响不大,但使Curie点提高20K^30K,其原因是母相的B2→L21转变导致的有序化程度提高。粉末试样X射线衍射发现1423K和773K2种温度处理后都只出现L10(2M)晶体结构类型的马氏体,并且合金粉末化后降低了马氏体相变温度和增加了γ相的析出,但块状Ni52Ga28Fe17Co3合金773K淬火后为14M型马氏体。
The effects of Co concentration x on the martensitic transformation and magnetic properties of Ni52Ga28Fe20-xCox alloys were investigated by optical metallography, SEM, XRD, DSC and VSM methods. The results show that the martensitic transformation temperatures of Ni52Ga28Fe20-xCox alloys elevate greatly with the increase of x. The increase of x leads to the increase of martensitic transformation temperatures by 50 K-60 K in the range of x≤6, but their Curie points. It has hardly any effects on martensitic transformation temperature but makes Curie points increasing by 20 K～30 K when the quench temperature fell down from 1423 K to 773 K due to the increase of order degree of mother phase from B2→L21 transformation. The X-ray diffraction patterns of powder sample show that only the L10 （2M） type martensitic phases appears in alloys quenched from 1423 K or 773 K, but the XRD pattern of bulk sample shows that the Ni52Ga28Fe17Co3 alloy has a 14M type martensite. It is also found that the martensitic transformation temperature decreased and the depositing of y phase increased by this powder process.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期740-745,共6页
Rare Metal Materials and Engineering
基金
教育部留学回国人员科研启动基金资助项目
