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D1$_{\rm a}$结构;而当Fe含量为10%时,Ni$_{70}$Mo$_{20}$Fe$_{10}$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Ni$_{70}$Mo$_{20}$Fe$_{10}$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 D1$_{\rm a}$ structure when the content of iron is less than 10% in the ordered Ni₄Mo alloy. However, the crystal structure of the ordered Ni$_{70}$Mo$_{20}$Fe$_{10 }$ 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 Ni$_{70}$Mo$_{20}$Fe$_{10 }$ 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.