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Lanthanum oxide dispersion strengthened (ODS) molybdenum has excellent high temperature properties but low ductility. The effect of heat treatment on the mechanical properties and formability of ODS-Mo sheet has been investigated in the temperature from 1500oC to 1800oC. Mechanical tests included three point bending, high temperature tensile testing, and hardness testing. Optical metallography, SEM, and TEM were used to evaluate the microstructure for each heat treatment condition. The 1500oC heat treatment temperature led to cracking due to incomplete transformation to a stress relieved structure. Samples treated at 1800$o$C produced 90o bends but the bend surfaces of samples treated for long time at this temperature were not smooth. Heat treated samples had lower YS and UTS than the as-rolled material. Grain growth along the rolling direction was faster than along transverse directions. This behavior is explained by the banding of oxide particles along the rolling direction.
These 17 papers from the 1998 TMS Annual Meeting & Exhibition focus on recent developments of molybdenum and its alloys, including development and fabrication, metallurgy and properties, and materials testing and applications.