热处理工艺对铝基碳化硼板材性能的影响

Effect of heat treatment on properties of Al-B4C flats

选用热等静压法制备的铝基碳化硼板材(B4C体积分数为10.5%,下同),对铝基碳化硼板材进行热处理,测试热处理前后铝基碳化硼板材的密度、硬度、室温力学性能,并观察断口组织。结果表明,热处理后,铝基碳化硼板材的密度几乎相同,硬度显著提高;热处理工艺对铝基碳化硼板材的力学性能有显著影响,其中,经加热(500℃×3 h)、水淬、人工时效(170℃×1 h)后,Al-10.5%B4C板材的抗拉强度为365 MPa,断后伸长率为9.6%,比未热处理板材的抗拉强度提高了89.1%,而伸长率降低了48.3%。

Aluminum based boron carbide plate(B4C volume fraction is 10.5%,the same below)was prepared by hot isostatic pressing.The density,hardness,room temperature mechanical properties of aluminum based boron carbide plate before and after heat treatment were tested,and the fracture structure was observed.The results show that after heat treatment,the density and hardness of the board are almost the same,and the heat treatment process has a significant effect on the mechanical properties of the board.After heating(500℃×3 h),water quenching and artificial aging(170℃×1 h),the tensile strength and elongation of the board are 365 MPa and 9.6%respectively,which are better than those of the board without heat treatment,the tensile strength increased by 89.1%,while the elongation decreased by 48.3%.