Effect of Hot Extrusion and Heat Treatment on the Microstructure and Tensile Properties of Network Structured TiBw/TC18 Composites
Received date: 2022-04-21
Revised date: 2022-08-01
Online published: 2022-09-01
Supported by
National Key Research and Development Program of China(2021YFB3701203);National Natural Science Foundation of China(52171137);National Natural Science Foundation of China(52071116);Natural Science Foundation of Heilongjiang Province(TD2020E001);Heilongjiang Postdoctoral Fund(LBH-Z20058)
To improve the comprehensive performance of Ti matrix composites for defense applications such as aviation and aerospace, as-sintered TiBw/TC18 composites with different reinforcement contents were hot extruded and heat-treated. The composites were characterized and analyzed by OM, SEM, and TEM. The mechanical properties of the composites were measured using an electronic universal testing machine. By extruding in the β single-phase region, the β grain size of TiBw/TC18 was reduced from 70 μm to about 40 μm. After the subsequent triple-annealing or solution aging heat treatment, α phase with different sizes was precipitated and distributed in the β phase. The elongation of the as-extruded composites significantly showed improvement, but the strength decreased by about 17%. After applying the triple-annealing heat treatment, the tensile strength and elongation of 2.0%TiBw/TC18 (volume fraction) reached 1200 MPa and 21.7%, which are higher by 5.5% and 189%, respectively, than those in the sintered state. Moreover, after applying the solution aging heat treatment, the as-extruded 2.0%TiBw/TC18 exhibited tensile strength and elongation of 1389 MPa and 9.9%, which are higher by 22.2% and 32%, respectively, than those exhibited by as-sintered 2.0%TiBw/TC18. Consequently, the hot extrusion can effectively reduce the grain size of as-sintered TiBw/TC18, and the tensile properties of the extruded TiBw/TC18 can be modified to meet the requirements of different service conditions through different subsequent heat treatments.
Run CHEN , Shuai WANG , Qi AN , Rui ZHANG , Wenqi LIU , Lujun HUANG , Lin GENG . Effect of Hot Extrusion and Heat Treatment on the Microstructure and Tensile Properties of Network Structured TiBw/TC18 Composites[J]. Acta Metall Sin, 2022 , 58(11) : 1478 -1488 . DOI: 10.11900/0412.1961.2022.00187
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