原位合成(TiB+TiC)/Ti-8Al-1Mo-1V复合材料的显微组织和室温力学性能
Microstructure and Mechanical Properties of In-situ Synthesized (TiB+TiC)/Ti-8Al-1Mo-1V Composites
摘 要
利用钛与碳、B4C之间的化学反应和自耗电弧熔炼工艺原位合成制备了不同含量TiB和TiC(两者物质的量比为1∶1)增强的Ti-8Al-1Mo-1V基复合材料;利用X射线衍射仪、光学显微镜和扫描电镜分析了复合材料的物相组成和增强体的形态,并讨论了增强体对复合材料室温力学性能的影响.结果表明:复合材料中增强体分布均匀,TiB呈短纤维状,TiC呈等轴状;当增强体的体积分数为10%时,复合材料的屈服强度、抗拉强度和弹性模量明显提高,而塑性则降低;当增强体的体积分数为20%时,弹性模量进一步提高,塑性很差,转变成脆性材料.
TiB
TiC
弹性模量
力学性能
titanium matrix composite
TiB
TiC
elastic modulus
mechanical property
Abstract
Ti-8Al-1Mo-1V matrix composites (TMCs) reinforced with TiB and TiC which molar ratio was 1∶1 were synthesized by a consumable arc-melting technology utilizing the reactions of Ti with C and B4C.The phase constituents were identified by X-ray diffraction (XRD) and microstructure was observed with optical microscopy (OM) and scanning electron microscopy (SEM).The effects of reinforcements on the mechanical properties at room temperature were discussed.The results show that the distribution of reinforcements in the composite was homogeneous.TiB exhibited a chopped fiber-like shape and TiC was equioxed.For the composite with 10vol.% reinforcements,the yield strength,ultimate tensile strength and elastic modulus increased while the ductility decreased.For the composite with 20vol.% reinforcements,elastic modulus increased significantly.However,the ductility decreased sharply and the fracture types turned from plastic fracture to brittle fracture.
中图分类号 TB333
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(10577013)
收稿日期 2007/12/19
修改稿日期 2009/3/3
网络出版日期
作者单位点击查看
备注刘钊(1981-),男,湖北孝感人,硕士研究生.
引用该论文: LIU Zhao,Lv Wei-jie,LU Jun-qiang,ZHANG Di. Microstructure and Mechanical Properties of In-situ Synthesized (TiB+TiC)/Ti-8Al-1Mo-1V Composites[J]. Materials for mechancial engineering, 2009, 33(5): 1～4
刘钊,吕维洁,卢俊强,张荻. 原位合成(TiB+TiC)/Ti-8Al-1Mo-1V复合材料的显微组织和室温力学性能[J]. 机械工程材料, 2009, 33(5): 1～4
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