Oxygen-induced brittle cracking and low steady stress in Mo10Nb alloy during hot deformation
Source abstract
Abstract
Mo10Nb alloy is susceptible to brittle cracking during hot deformation due to a small amount of oxygen. In order to find out the mechanism of oxygen-induced cracking and low steady stress, here we investigate the influence of oxygen on the microstructure and hot deformation of Mo10Nb. Results show that the high chemical affinity with Nb makes the O atoms tend to dissolve inside the grains of Mo10Nb, instead of the segregation at grain boundaries of Mo. The steady stress of Mo10Nb is decreased by the interstitial oxygen during hot deformation, which increases the diffusivity of the alloy at high temperature. The O element induces the low cleavage energy and dislocation pile-up, and thus causes the transgranular embrittlement in Mo10Nb during hot deformation. Our investigation is enlightening to better understand the oxygen-induced embrittlement of Mo10Nb alloy.
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