研究了少量TiB2对两相型钛合金Ti-6Al-4V的β晶粒长大行为的影响.在β相变点以上进行高温固溶+水淬处理,之后进行显微组织观察确定合金晶粒度.实验研究发现,TiB2在钛合金中最终转化为TiB,这些TiB粒子主要分布在晶界处并显著限制了合金的晶粒长大.在超过相变点100℃固溶120 min,Ti-6Al-4V-0.32TiB2合金β晶粒仅仅长大了79 μm.动力学分析表明,Ti-6Al-4V-0.32TiB2的晶粒长大指数分布在0.036～0.037范围内,远远小于Ti-6Al-4V合金,而晶粒长大激活能是Ti-6Al-4V合金的4倍.理论计算结果表明,晶界TiB粒子的排列方式也显著影响钉扎效果.
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