论文部分内容阅读
用熔铸法制备了硼化物颗粒增强钛基复合材料 ,通过XRD和SEM ,详细研究了含铝量变化时合金的相组成及硼化物的形态和存在方式的变化规律 .结果表明 :合金的相组成主要受铝含量的影响 ,铝含量相对较低时合金基体为α -Ti,硼化物为单一的TiB ,铝量增加时基体中形成α2 相及γ相 ,并开始出现TiB2 ,合金中TiB含量逐步减少 ,TiB2 含量逐步增加 ,最终硼全部以TiB2 形式存在 ;硼化物形态上共晶TiB主要呈针状或片状 ,尺寸为 2 0～ 5 0 μm ,TiB量少时呈现沿晶界分布特征 ,硼量增加时开始出现板状TiB ,TiB2 典型形态为六面棱柱体块状 ,另外还存在少量小尺寸的带有分杈的六面棱柱体状
The boride particle reinforced titanium matrix composites were prepared by melt casting method. The phase composition of the alloy and the change of the morphology and existence mode of boride were investigated by XRD and SEM. The results show that the phase composition Mainly affected by the aluminum content, the alloy matrix is α -Ti and the boride is single TiB when the content of aluminum is relatively low. When the content of aluminum increases, α2 phase and γ phase are formed in the matrix and TiB2 starts to appear. The content of TiB in the alloy gradually increases TiB2 content gradually increases, and the final boron is all in the form of TiB2. The morphology of the eutectic TiB in the boride morphology is acicular or lamellar with a size of 20-500 μm. When the amount of TiB is small, the distribution along the grain boundary is small, Plate-shaped TiB began to appear as the amount of boron increased, and the typical form of TiB2 was a hexagonal prism block with a few small-sized hexagonal prismatic shapes with bifurcations