摘要
The flow behavior of a cast Ti-25Al-10Nb-3V-1Mo alloy based onTi3Al, with and without hydrogen content, was investigated under isothermal compression test at strain rates of 0.1s-1 to 0.001s -1 in the temperature range of 900℃ to1000 ℃. The hot compression peak stress (or the maximum flow stress) of the alloy withand without hydrogen decreases with the increasing temperature and the decreasingstrain rate. Hydrogenation makes the hot compression peak stress decrease by 37%～53%, which corresponds to lowering the deformation temperature by about 50℃.Strain rate does not change the favorable effect of hydrogenation on hot compressionflow behavior at all three deformation temperatures. The microstructure of the alloywith 0.2% H (mass %) deformed at a fixed temperature exhibits the same feature asthat of the alloys without hydrogenation deformed at higher temperatures for bothstrain rates. Hydrogenation has the same effect on microstructure as strain rate andtemperature.
The flow behavior of a cast Ti-25Al-10Nb-3V-1Mo alloy based onTi3Al, with and without hydrogen content, was investigated under isothermal compression test at strain rates of 0.1s-1 to 0.001s -1 in the temperature range of 900℃ to1000 ℃. The hot compression peak stress (or the maximum flow stress) of the alloy withand without hydrogen decreases with the increasing temperature and the decreasingstrain rate. Hydrogenation makes the hot compression peak stress decrease by 37%～53%, which corresponds to lowering the deformation temperature by about 50℃.Strain rate does not change the favorable effect of hydrogenation on hot compressionflow behavior at all three deformation temperatures. The microstructure of the alloywith 0.2% H (mass %) deformed at a fixed temperature exhibits the same feature asthat of the alloys without hydrogenation deformed at higher temperatures for bothstrain rates. Hydrogenation has the same effect on microstructure as strain rate andtemperature.
