The effect of texture and microstructure on the properties of Mo bars

The properties and microstructure of pure Mo bars were investigated during upset-forged deformation. The results show that transverse elongation and microhardness of the draw-forged molybdenum samples are improved by upset deformation. After the reduction increases to 80%, the transverse elongation and microhardness of Mo bars are up to 5% and 235HV. The texture of 〈110〉 fiber in draw-forged Mo bars is changed to 〈100〉 fiber and 〈111〉 fiber during upsetting process. Meanwhile, equiaxed dislocation cells are formed in 〈100〉 oriented grains, and microbands are formed in 〈111〉 oriented grains. Many sessile dislocations are usually formed in 〈100〉 oriented grains and glissile dislocations are usually formed in 〈111〉 oriented grains. The fracture mechanism of these different grains is quite different.