This study evaluates the tensile properties and behavior of three commercially available and two experimental vacuum arc cast molybdenum base alloys that have been GT A welded. Exceptionally low applied strain rates were required to produce significant elongation in the commercial specimens tested. Strain localization in the narrow HAZ results in high effective strain rates in that area. The experimental alloys exhibited more than five times greater elongation compared with the commercial material at practical strain rate levels. In commercial alloys, the fracture location was influenced by the weld filler metal, with TZM causing fracture in the fusion zone whereas Mo-50Re caused fracture in the HAZ.
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