Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 35    No. 9    September 2025

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Structural characteristics, tensile properties and room-temperature high-cycle fatigue properties of heterogeneous structure in near-α titanium alloys
Ji-fei HU1, Peng QI2, Wu WEI1, Bo-long LI1, Tong-bo WANG2, Jia-ming YIN3, Zuo-ren NIE1

1. Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China;
2. Chinalco Research Institute of Science and Technology Co., Ltd., Beijing 102209, China;
3. Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

Abstract:A heterogeneous structure composed of elongated primary α and secondary α grains with a size of 670 nm was produced by subjecting the bimodal microstructure of a titanium alloy to hot rolling, annealing, and aging treatments. This heterogeneous structure exhibited significantly improved strength owing to a combination of heterogeneous deformation-induced strengthening and dislocation strengthening. A short-duration high-temperature heat treatment facilitated a synergistic enhancement of yield strength and elongation at both room temperature and 650 °C. The fracture elongation at room temperature and 650 °C increased by 36.7% and 130.4%, respectively, compared with that of bimodal microstructure. The stacking of geometrically necessary dislocations with a single slip system at the phase boundary and the longer effective slip length of the dislocations are the reasons for the significant improvement in elongation. The elongated primary α phase in lamellar bimodal microstructure, composed of multiple primary α grains, has better resistance to the anti-fatigue crack initiation effect.

 

Key words: titanium alloys; heterostructures; ductility; high-temperature deformation; heterogeneous deformation- induced strengthening

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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