Microstructure characterization and thermal stability of tnm alloy fabricated by powder hot isostatic pressing

Yichao Wang, Xiangyi Xue, Hongchao Kou, Fengming Qiang, Yonghao Yu, Zhongwei Yin, Jinshan Li

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A TNM alloy ingot was fabricated with powder hot isostatic pressing (P-HIP) and short-time exposure treatment conducted at 750–1050 C for 2–5 h. The tensile mechanical properties were investigated at room temperature and 800 C. The results revealed that a fully lamellar microstructure of P-HIPed TNM alloy with only 0.3 vol.% β0 phase could be obtained by hot isostatic pressing at 1260 C, under the pressure of 170 MPa, held for 4 h. When the exposure temperature was below 850 C, the α2 lamellae were transformed into nano-scaled (α2 + γ) lamellae (i.e., the α2 →α2 + γ transformation). With increases in the exposure temperature, the β0 phase began to precipitate within the α2 lamellae (α2 →β0 transformation) at 950 C. The α2 →γ and the α2 →β0 transformation both happened at 950–1050 C, and the higher exposure temperature accelerated the diffusion of Mo and facilitated the α2 →β0 transformation. The yield strength and elongation at RT and 800 C were both improved after short-time high-temperature exposure treatment. The uniform distribution and nano-scaled interfacial β0 phase provided precipitation strengthening and were not harmful to the elongation.

Original languageEnglish
Article number1720
JournalMetals
Volume11
Issue number11
DOIs
StatePublished - Nov 2021

Keywords

  • Hot isostatic pressing
  • Microstructure
  • Tensile properties
  • Thermal stability
  • TiAl-based alloys

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