摘要
研究了热处理条件对锻态2.5%(TiB+TiC)/Ti(体积分数)复合材料显微组织和力学性能的影响。结果表明:固溶时效处理对复合材料的基体组织特征有显著影响,在两相区进行固溶时效处理后,得到等轴和双态组织,随固溶温度的升高,初生α相含量逐渐降低,而β转变组织含量逐渐升高,当固溶温度超过β转变温度时,得到全片层组织。TiB和TiC增强相在热处理过程中较为稳定,形态与分布无明显变化。固溶时效处理后,锻态复合材料的抗拉强度提高而塑性降低,随固溶温度的升高,复合材料的室温抗拉强度和塑性均有明显增加,而650℃下抗拉强度与塑性与室温下表现出相反的规律。复合材料经1050℃/2 h/AC+600℃/6 h/AC处理后综合性能最好,室温抗拉强度为1215.8 MPa,延伸率为3.14%,650℃下抗拉强度为629.9 MPa,延伸率为15.9%。
The effects of heat treatment on microstructure and mechanical properties of as-forged 2.5%（TiB＋TiC）/Ti composite（volume fraction） have been studied. The results show that solution and aging treatments have a significant impact on the matrix characteristics and tensile properties of the composite. Equiaxed, bimodal and fully lamellar microstructures are obtained, the content of primary α declines while the content of the transformed β phase increases with increasing of solution temperature. The Ti B and TiC reinforcements are stable during heat treatment and their morphologies and distribution hardly change. The tensile strength increases while the elongation decreases after solution and aging treatment. With increasing of the solution temperature, both the tensile strength and elongation rise at room temperature, while the tensile strength and elongation tested at 650 ℃ exhibit a contrary tendency. After the heat treatment of 1050 ℃/2 h/AC＋600 ℃/6 h/AC, the composite presents superior comprehensive properties including tensile strength of 1215.8 MPa and elongation of 3.14% at room temperature, while tensile strength of 629.9 MPa and elongation of 15.9% at 650 ℃.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第12期3172-3176,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目(51504163)
太原理工大学人才基金资助项目(tyut-rc201343a)
太原理工大学校青年基金(2013T003)
关键词
钛基复合材料
热处理
显微组织
力学性能
titanium matrix composite
heat treatment
microstructure
mechanical properties
