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使用大尺寸球形Ti60钛合金粉与细小TiB2粉,通过低能球磨与反应热压烧结,成功制备了增强相呈网状分布的TiB晶须增强Ti60合金基(TiB_W/Ti60)复合材料。对TiB_W/Ti60复合材料进行热处理,以改善其组织结构与力学性能。结果表明:随着固溶温度的升高,TiB_W/Ti60复合材料基体中初生α相(密排六方相)含量减少,相应地转变β组织(α′(马氏体)+残留β相(体心立方相))含量增加,TiB_W/Ti60复合材料的抗拉强度升高,塑性降低;经过1 100℃/1h固溶处理之后,TiB_W/Ti60复合材料的室温抗拉强度为1 470 MPa,延伸率为1.9%。经过时效处理后,转变β组织中的α′相分解成细小α+β相。经过1 100℃/1h固溶+600℃/8h时效处理后TiB_W/Ti60复合材料的硬度达到HV538,抗拉强度达到1 552 MPa,延伸率为1.5%,经过1 000℃/1h固溶+600℃/8h时效处理,其抗拉强度达到1 460 MPa,延伸率为2.2%。
The large Ti60 TiW alloy (TiB_W / Ti60) composites reinforced by TiB whisker reinforced by mesophase were successfully prepared by using low-energy ball milling and reactive hot-pressing sintering. TiB_W / Ti60 composites were heat-treated to improve their structure and mechanical properties. The results show that the content of primary α phase (hexagonal hexagonal phase) in TiB_W / Ti60 matrix decreases with the increase of solution temperature and the β phase (α ’(martensite) + residual β phase TiC_W / Ti60 composites increased with the increase of Ti content, the tensile strength and the ductility of TiB_W / Ti60 composites increased. After TiC_W / Ti60 solution treated at 1100 ℃ for 1h, the tensile strength at room temperature of TiB_W / Ti60 composites was 1 470 MPa, The rate was 1.9%. After aging treatment, the transformation of β organization α ’phase decomposition into small α + β phase. The hardness of TiBW / Ti60 composites reaches HV538 after 1 100 ℃ / 1h solution treatment and 600 ℃ / 8h aging treatment, the tensile strength reaches 1 552 MPa, the elongation is 1.5%, after 1000 ℃ / 1h solution +600 ℃ / 8h aging treatment, the tensile strength reached 1 460 MPa, elongation 2.2%.