B4C/TA19复合材料显微组织和力学性能研究

纳米碳化硼(B4 C)颗粒与TA19钛合金球形粉末经球磨混合后,采用放电等离子烧结技术(SPS)成功制备出增强相呈准连续网状分布的B4 C/TA19复合材料.研究了增强体B4 C对复合材料显微组织和力学性能的影响.结果表明,B4 C颗粒的加入可以明显提高材料的抗拉强度,当B4 C颗粒的添加量为0.5％时,复合材料的抗拉...

Research on Microstructure and Mechanical Properties of B4C/TA19 Composites

Nano boron carbide(B₄C) particles and TA19 titanium alloy spherical powder were mixed by ball milling,and B₄C/TA19 composites were successfully prepared by spark plasma sintering(SPS).The reinforcing phase of B₄C was distributed quasi-continuous in network structure of the composites.The effect of B₄C reinforcement on microstructure and mechanical properties of composites was studied.The results show that the addition of B₄C can obviously improve the tensile strength of B₄C/TA19 composites.When the addition of B₄C is 0.5%,the tensile strength of the composite increases from 986.8 MPa to 1191.2 MPa,with an increase of 20.7%.When the addition of B₄C is 0.1%,the composite has excellent strong-plastic matching,the tensile strength reaches 1065.3 MPa,which is increased by 8.0%compared with TA19 titanium alloy,the elongation reaches 13.4%.The strengthening mechanism of B₄C/TA19 composites is attributed to the strengthening of fine grain and the interfacial strengthening of network structure.