Densification Mechanism and Microstructure Evolution of Ti‐48Al‐2Cr‐8Nb Alloy by Spark Plasma Sintering. Issue 11 (18th September 2019)

• Record Type: Journal Article
• Authors: Sun, Haoxuan; Wang, Zhenhua; Du, Yulei; Yuan, Juntang
• Is Part Of: Crystal research and technology. Volume 54:Issue 11(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-18
• Subjects: densification -- microstructure -- phase transition -- spark plasma sintering -- Ti‐48Al‐2Cr‐8Nb alloy; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.201900107
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract: In this work, Ti‐48Al‐2Cr‐8Nb alloy is sintered via spark plasma sintering with pre‐alloyed powders prepared by the atomized method. The densification mechanism and microstructure evolution of the spark plasma sintered Ti‐48Al‐2Cr‐8Nb alloy are analyzed. The sintering process is divided into two stages of densification and microstructure transformation. First, the densification mechanism of the powder materials at different sintering temperatures is investigated. At the beginning of the sintering process, the powder particles are closely rearranged under pressure. In the middle of the sintering process, the plastic deformation of the powder particles and the material migration between the adjacent particles promote the densification into the high‐speed stage. In the late stages of sintering, the unique equilibrium phase transition of the TiAl alloy allows the densification to be completed quickly. Additionally, the formation process and phase transition mechanism of the near gamma structure, the duplex structure, the full‐lamellar structure, and spherical structure in Ti‐48Al‐2Cr‐8Nb alloy are systematically studied. Abstract : In this work, Ti‐48Al‐2Cr‐8Nb alloy is sintered via spark plasma sintering with pre‐alloyed powders prepared by the atomized method. The densification mechanism and microstructure evolution of the spark plasma sintered Ti‐48Al‐2Cr‐8Nb alloy are analyzed. In addition, the influence of the microstructure on mechanical properties has also been studied.