Abstract
Tensile tests at temperature 173–363 K were carried out for the powder-metallurgy molybdenum alloys containing 0·1 - 1·0 mass% Ti. Then critical stress and critical temperature representing low-temperature strength and ductility of the material, respectively, were evaluated. A small addition of Ti increased both intergranular and transgranular fracture strengths, and hence increased the critical stress. The ductility of molybdenum was improved and the ductile-to-brittle transition temperature was lowered by adding Ti, primarily due to the increase in critical stress. The fracture mode was predominantly intergranular with or without Ti additions.
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