Key Soon Lee1 and Shotaro Morozumi2
1Daeduk Engineering Center, Korea Advance Energy Research Institute, Daeduk, Korea
The effect of substitutional alloying elements, such as niobium, titanium, vanadium and zirconium, on the nil ductility transition temperature of molybdenum was studied by a three point bend test. All the specimens were prepared by arc-melting with 0.2 mass% of scandium as a deoxidizer, then rolled and stress-relieved by annealing.
With increasing alloy content, the yield stress was increased, and the transition temperature was shifted to the higher temperature side, but the cleavage fracture stress was little affected. Since the increase in yield stress was related to the atomic size effect of the elements, it was concluded that the rise of the transition temperature was attributed to the solid-solution hardening of the elements.
nil ductility transition temperature, molybdenum, molybdenum-niobium alroy, molybdenum-titanium alloy, molybdenum-vanadium alloy, molybdenum-zirconium alloy, scandium-added molybdenum
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