Abstract
A differential scanning calorimetry (DSC) method was developed capable of measuring the rate of in situ alloying during Al–V master alloy (MA) sintering of Ti6Al4V based on monitoring the characteristics of the β–α phase transformation during cooling from the sintering temperature. The beta transus temperature and transformation temperature range both decreased with increasing sintering time, while the enthalpy of transformation increased. Supporting microstructural analysis confirmed that this change in the β–α phase transformation behaviour was due to interdiffusion of Ti, Al and V between the MA particle and CP-Ti matrix and the progressive dissolution of the MA particles. The majority of in situ alloying and MA dissolution occurred within one hour, while 3 h of sintering was required to achieve a level of homogenisation similar to that measured for a wrought Ti6Al4V sample. The use of finer MA particles resulted in more rapid and complete homogenisation.
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