Low-oxygen, uniform, and dense Mo10Nb alloys obtained by combining in situ deoxygenation and mechanical alloying

Abstract

A high oxygen content, poor uniformity and low density are difficult issues for Mo10Nb alloys prepared by powder metallurgy. In this study, Mo10Nb sintered billets are fabricated by nanocarbon addition and mechanical alloying. The results show that nanocarbon can remarkably reduce the O content of the Mo10Nb sintered billets with a slight increase in the C content. Low-oxygen, uniform, and dense Mo10Nb alloys can be obtained by combining in situ nanocarbon deoxygenation and mechanical alloying. Abrupt changes in stress appear in the stress–strain curves of the Mo10Nb alloy prepared from mixed powder, and the addition of nanocarbon can delay the first stress mutation. The stress changes are mainly caused by the unalloyed Nb containing a high oxygen content. However, the stress change disappears in the stress–strain curve of the Mo10Nb alloy with a low oxygen content, good uniformity and high density.