The microstructure and texture evolution of pure molybdenum sheets under various rolling reductions

摘要

Pure molybdenum sheets were prepared by powder metallurgy and unidirectional rolling process. The microstructure, texture, grain orientation, mechanical properties and fracture mechanism of sintered samples were investigated. The results show that tensile strength and microhardness of 95% rolled sheet are 1028.095 +/- 19.32 MPa and 323.2 +/- 11.68 HV. The main texture components of (011)<110> is Goss texture with reduction in the range of 70-95%. Two grain orientations of <111> fiber & <100> fiber and <100> fiber & <110> fiber are formed in the 47% and 95% rolled molybdenum sheets, respectively. Meanwhile, the fiber structure become more refined and oriented in the rolled molybdenum sheets when the rolling reduction is > 87%. Brittle characteristics show typical cleavage failure.