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Effect of Heat Treatment on Microstructure Evolution and Mechanical Properties of 2.5 vol% TiBw/TA15 Composites with Different Deformation Statuses
Author(s) -
Jiao Xueyan,
Du Dandan,
Chen Wenzhen,
Zhang Wencong,
Yang Jianlei,
Cui Guorong
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800190
Subject(s) - materials science , microstructure , ultimate tensile strength , elongation , composite material , deformation (meteorology) , extrusion , volume fraction , phase (matter) , brittleness , whisker , whiskers , chemistry , organic chemistry
In this study, heat treatments of solution and aging are performed on 2.5 vol% TiBw/TA15 composites with different deformation statuses. The results indicate that the mechanical properties of the 2.5 vol% TiBw/TA15 composites are influenced by the microstructure, which is affected by the thermal processing and heat treatment history. The elongated α phase is obtained in the powder extrusion process followed by air cooling (EAC) and is then spheroidized in the rotary swaging process. After solution at 970 °C, the α phase is further spheroidized and partially transformed into the β phase at different degrees depending on the deformation status. After aging at 930 °C, the volume fraction of the equiaxial α phase increases significantly and the transformed β phase is decomposed into the clustered α + β laths at different degrees. Although experiencing the same post‐heat treatment, the influence of the deformation history affects the microstructure. After solution at 970 °C for 30 min and aging at 930 °C for 100 min, the EAC + RSAC sample exhibits an ultimate tensile strength of 1335 MPa and an elongation of 4.2%. Additionally, the fracture mechanism consists of the brittle fracture of the TiB whiskers and the ductile failure of the TA15 matrix.