(1. 西北有色金属研究院,西安 710016;
2. 沈阳铸造研究所,沈阳 110022)
摘 要: 采用熔铸工艺制备了含硼量为0.2%~0.5%(质量分数)、含碳量为0.5%~2.0%(质量分数)的ZTC4/B/C钛基复合材料,分析并测试了合金的铸态组织和力学性能。研究结果表明:钛硼相提高TC4合金铸棒的弹性模量,硼元素添加量为0.5%时,合金弹性模量提高30%,同时具有较好的强塑性匹配。C元素大大提高ZTC4合金铸棒的强度,添加0.5%C,其抗拉强度达到1 300 MPa,提高了25%。ZTC4合金铸棒的显微组织由片层α或球状α、晶界b及短棒状第二相TiB、球状颗粒且具有浮凸感的第二相TiC组成,B元素具有细化晶粒的作用。
关键字: 铸造钛合金;微量元素;弹性模量;显微组织;力学性能
(1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. Shenyang Research Institute of Foundry, Shenyang 110022, China)
Abstract:ZTC4/B/C titanium matrix composites containing B and C with B content ranging from 0.2% to 0.5% (mass fraction) and C content ranging from 0.5% to 2% (mass fraction) were fabricated using melting-casting process. The microstructure and mechanical properties of as-cast ZTC4/B/C titanium matrix composite were studied.The results indicate that elastic modulus of ZTC4/B is increased by 30% with 0.5%B. The ultimate tensile strength (UST) of ZTC4/B/C reaches 1 300 MPa with 0.5%B and 0.5%C, which is increased by 25%. The microstructures of as-cast ZTC4/B/C consist of lamellar α, grain boundaries β and the second phase TiB with bar-like shape and the second phase TiC with spherical-like shape. The microstructures of ZTC4/B/C can be refined with the increase of B content.
Key words: cast titanium alloy; trace element; elastic modulus; microstructure; mechanical properties