Abstract
Microstructures and compression properties of Ti–45Al–8.5Nb–(W,B,Y) alloy consolidated by spark plasma sintering (SPS) and hot isostatic pressing (HIP) were investigated. The results showed that sintering temperature has a significant effect on microstructure. When the sintering temperature is 1000 °C, the dendritic microstructure of as-SPS alloy is similar to that of the alloying powder. At 1100 °C, the interfaces of these powder particles are still discernible, but near γ microstructure appear in every particle. A typical fully lamellar (FL) microstructure followed by two types of microsegregations, such as β-segregation and α-segregation, is successfully developed at 1200 °C. However, FL microstructure becomes coarser at 1300 °C. As-HIP alloy has near lamellar (NL) microstructure along with β-segregation. The morphologies of β phase in as-HIP alloy are different from those in as-SPS alloy. The alloy exhibits excellent compression properties at elevated temperatures. When compression temperature is higher than 1100 °C, high quality compressed samples without cracks can be obtained even if engineering compression strain is up to 80% for the strain rates of 1 × 10 −1 to 10 −3 S −1.
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