Fe含量对有序态Ni4Mo合金晶体结构及性能的作用  

Effect of Fe content on the crystal structure and mechanical properties of ordered Ni4Mo alloy

作　　者：王滕 陈业新[1] 谢亚茜 WANG Teng;CHEN Yexin;XIE Yaxi(Institute of Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《上海大学学报（自然科学版）》2020年第1期85-94,共10页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51271102)。

摘　　要：研究了Fe含量对有序态Ni4Mo合金晶体结构及力学性能的作用,结果表明:当在有序态Ni4Mo合金中添加的Fe含量小于10%时,合金的晶体结构仍为单相有序D1a结构;而当Fe含量为10%时,Ni70Mo20Fe10合金的晶体结构变为单相有序面心立方结构;如果继续增加合金中的Fe含量,则在合金中析出了密排六方结构的第二相.Fe元素通过改变合金的晶体结构显著提高了有序态Ni4Mo合金拉伸时的延伸率,有序态Ni70Mo20 Fe10合金在真空中的延伸率达到了30.9%,比有序态Ni4Mo合金的延伸率提高了12倍.Fe合金化也有效降低了有序态Ni4Mo合金在氢气环境中的脆性敏感性.The effect of iron content on the crystal structure and mechanical properties of ordered Ni4Mo alloy has been studied in this paper.The results show that the crystal structure of the alloys is still single-phase with D1a structure when the content of iron is less than 10%in the ordered Ni4Mo alloy.However,the crystal structure of the ordered Ni70Mo20Fe10 alloy is single phase with the face-centered cubic structure when the content of iron is 10%in the alloy.When the content of iron is increased continuously,there is a second phase with close-packed hexagonal structure precipitated in alloy.The elongation of the ordered Ni70Mo20Fe10 alloys reaches 30.9%,which is 12 times of the elongation of the ordered Ni4Mo alloys when tested in vacuum.Additionally,the hydrogen embrittlement susceptibility of the ordered Ni4Mo alloy in gaseous hydrogen is also effectively reduced by iron alloying.

关 键 词：Ni4Mo合金 晶体结构 延伸率 氢脆敏感性 

分 类 号：TG135[一般工业技术—材料科学与工程]