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结合LSM法和MCR法原位反应生成TiB2 粒子增强Al Si Mg复合材料。研究发现 :原位生成TiB2 粒子呈等轴状且尺寸 <1μm ,大都均匀分布在共晶组织中 ,与共晶Si交织在一起 ,在α(Al)中只有少量的TiB2 粒子 ;原位TiB2 粒子可明显强化Al Si Mg复合材料 ,且随着TiB2 粒子数量的增加 ,强化效果也随之提高 ,而且延伸率也略有升高 ,如 6 %TiB2 /ZL10 4复合材料室温拉伸强度可达 2 96MPa ,延伸率为 5 .5 %;热处理 (T6)可将共晶Si由原先的连续棒状变为孤立的颗粒状 ,大幅度提高材料抗拉强度 ,使 6 %TiB2 /ZL10 4复合材料室温拉伸强度达386MPa ,而材料仍属于韧性材料
In situ reaction of LSM and MCR to form TiB2 particle reinforced Al Si Mg composites. The results show that in-situ TiB2 particles are equiaxed and less than 1μm in size, mostly distributed in the eutectic structure and interwoven with eutectic Si, with only a small amount of TiB2 particles in α (Al) Obviously strengthened Al Si Mg composite material, and with the increase of the amount of TiB2 particles, the strengthening effect is also increased, and the elongation is also slightly increased, such as 6% TiB2 / ZL10 4 composite tensile strength at room temperature up to 2 96MPa , Elongation of 5.5%; heat treatment (T6) eutectic Si can be changed from the original continuous rod-like particles into or isolated, greatly improve the tensile strength of the material, so that 6% TiB2 / ZL104 composite tensile room temperature Strength up to 386MPa, while the material is still a tough material