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中文摘要：
钛合金因其优异的强韧性是具有广泛应用背景的轻质材料，但其硬度较低导致耐磨性较差，限制了其作为结构部件的应用。利用Cr3C2，B4C和石墨粉体之间的原位反应，制备了增强相体积分数为10％，TiC和TiB摩尔比1：1的（TiBw＋TiCp）／（Ti4.0Fe-7.3Mo-xCr）系钛合金基复合材料。混合粉料采用热压烧结方法在20MPa压力，氩气气氛保护，1300℃条件下保温1h进行制备。并对复合材料的微观组织结构和力学性能进行了研究。研究表明，通过控制Cr3C2，B4C和C的含量配比，改变以Cr3C2引入的cr含量对基体和增强相均有影响。复合材料基体由a—Ti和β-Ti两相组成，随Cr3C2引入的cr含量的增加，β-Ti的含量增加。并且当Cr3C2形式引入的Cr含量由2．2％增加到5．2％时，复合材料的强度得到显著提高，最高可达到908．7MPa，但其杨氏模量从170GPa下降到150GPa，而复合材料的洛氏硬度HRC稳定保持在55，大大高于基体合金。并且CraC2的引入也影响着复合材料中原位合成的TiBw与TiCp增强相的分布位置和形态。随由Cr3C2的引入Cr含量增加，TiB晶须的长径比提高，TiC颗粒的粒度细化，对复合材料的强度和韧性起到强化作用。
英文摘要：
Titanium alloys had a wide application as their good toughness and strength, but these alloys had relatively low abrasion resistance as the low hardness which limited their application as structure parts. The titanium matrix composites, 10% （TiBw ＋ TiCp）/ （Ti-4.0Fe-7.3Mo-xCr） composites with TiB： TiC = 1： 1, were prepared by in situ reaction between B4C, C, Cr3 C2 and titanium pow- ders. The mixtures were hot pressed at 1300℃, under a pressure of 20 MPa for i h in Ar atmosphere. Microstructure and mechanical properties of the composites were investigated. The results showed that＂ by changing the proportions of Cr3 C2, B4 C, and C, the content of Cr from Cr3 C2 could affect both the matrix and reinforcing phase. The composite was comprised of the c~-Ti and ~-Ti phase, and the content of 13-Ti phase increased with the content of Cr from Cr3 C2 increased by in situ reaction. With the increase of Cr content from Cr3C2 varied from 2.2% to 5.2%, the strength increased significantly, up to 908.7 MPa, while the Young＇s modulus decreased from 170 to 150 GPa, but the hardness （HRC） of the TMCs was much higher than that of the matrix alloy and remained steadily at 55. Ad- ditionally, the introduction of Cr3C2 could also influence the distribution and morphology of in situ formed TiBw and TiCp reinforce- ments. With the increase of Cr content from the Cr3C2, the aspect ratio of the TiBw rose, and the granularity of the TiCp declined which enhanced the strength and toughness of the composites.
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