Extraordinary high ductility/strength of the interface designed bulk W-ZrC alloy plate at relatively low temperature.

ABSTRACT: The refractory tungsten alloys with high ductility/strength/plasticity are highly desirable for a wide range of critical applications. Here we report an interface design strategy that achieves 8.5?mm thick W-0.5?wt. %ZrC alloy plates with a flexural strength of 2.5?GPa and a strain of 3% at room temperature (RT) and ductile-to-brittle transition temperature of about 100?°C. The tensile strength is about 991?MPa at RT and 582?MPa at 500?°C, as well as total elongation is about 1.1% at RT and as large as 41% at 500?°C, respectively. In addition, the W-ZrC alloy plate can sustain 3.3?MJ/m(2) thermal load without any cracks. This processing route offers the special coherent interfaces of grain/phase boundaries (GB/PBs) and the diminishing O impurity at GBs, which significantly strengthens GB/PBs and thereby enhances the ductility/strength/plasticity of W alloy. The design thought can be used in the future to prepare new alloys with higher ductility/strength.

SUBMITTER: Xie ZM 

PROVIDER: S-EPMC4632159 | biostudies-other | 2015

REPOSITORIES: biostudies-other