Abstract
In this investigation, the relationship between η phase and Ti/Al ratios of A286 superalloy with its tensile properties was evaluated. Alloys with Ti/Al ratio of 3, 10, and 20 were overaged at 820°C for 2, 4, 8, and 16 h to achieve different morphologies and volume fractions of η phase. The η volume fraction increased with an increase of Ti/Al ratio and its morphology changed from cellular to widmanschtaten. The cellular η phase enhanced the room temperature tensile strength of the superalloy by providing a barrier to grain boundary sliding. The increasing rate of strength was related to η-phase morphology. For the alloy with Ti/Al of 10, this rate was more than that of the alloy with ratio of 20, as a result of precipitation the widmanschtaten η.The η phase deteriorated the high temperature tensile strength, which can be attributed to lowering the matrix strength.
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