Strength–ductility balance of powder metallurgy Ti–2Fe–2W alloy extruded at high-temperature

Journal of Materials Research and Technology

Ammarueda Issariyapat¹  Katsuyoshi Kondoh²  Astuty Amrin³  Junko Umeda⁴  Ridvan Yamanoglu⁴  Abdollah Bahador⁴  Catalin Pruncu⁵ 

[1] Corresponding author.;;Design, Manufacturing &Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK;JWRI, Osaka University, 11-1 Mihogaoka, Ibaraki, 567-0047, Osaka, Japan;Kocaeli University, Engineering Faculty, Metallurgical and Materials Engineering Department, Kocaeli, Turkey;

关键词: Solid solution;    Grain refinement;    Hot extrusion;    Tensile properties;    Microstructure;    α + β Ti alloys;   

DOI  :  

来源: DOAJ

【 摘 要 】

This study aims to improve the mechanical properties of a Ti–2Fe base alloy by adding W solute and performing hot extrusion at a high temperature (1000 °C). W was added at 0, 1, 2, and 3 wt% using the powder metallurgy route and homogenization heat treatment. The as-extruded materials predominantly consisted of α phase with different microstructure morphologies; Ti–2Fe and Ti–2Fe–1W contained equiaxed α grains, while Ti–2Fe–2W and Ti–2Fe–3W showed equiaxed + acicular and acicular shape, respectively. Effective grain refinement was obtained in Ti–2Fe–2W (average grain size: ~1.64 μm), which greatly contributed to the strengthening. The solid solution of W was studied with X-ray powder diffraction, where a proportional increment of β lattice constant occurred as the W solute increased in the matrix (Ti–Fe). Additionally, electron backscatter diffraction analysis revealed that the W solution reduced the intensity of the prismatic texture along the extrusion direction. Based on the experimental evaluations, extruded Ti–2Fe–2W alloy exhibited a maximum yield strength of 925 MPa with excellent elongation 30% at room temperature, indicating a remarkable trade-off in strength and ductility.

【 授权许可】

Unknown