【摘要】 通过高温固溶及淬火处理,研究TiB晶须对Ti-B20合金β晶粒长大行为的影响。结果表明:处于晶界的TiB晶须显著限制了β晶粒的高温长大,在高于相变点125℃固溶120min后,Ti-B20-0.1B合金中β晶粒尺寸仅长大了55μm,而Ti-B20合金晶粒长大了220μm。从动力学角度分析了晶粒长大规律,Ti-B20合金的晶粒长大指数处于0.33~0.35范围内,接近于理论值0.5;而Ti-B20-0.1B合金的晶粒长大指数非常小,处于0.049~0.052范围内。计算结果表明:Ti-B20-0.1B合金的激活能显著高于Ti-B20合金的。含硼钛合金中TiB晶须长轴平行于晶界时,对晶粒长大的限制作用更显著。更多还原

【Abstract】 The effect of TiB whisker on the β grain growth behavior of Ti-B20 alloy was studied through solution treatment at high temperature and quenching.The results show that the TiB whisker at grain boundary significantly restricts the β grain growth when temperature is high.When solution treated at a temperature the 125 ℃ higher than the transformation temperature for 120 min,the size of β grain in Ti-B20-0.1B alloy increases by only 55 μm,while the size of the grain in Ti-B20 alloy increases by 220 μm.The rule of grain growth was analyzed by dynamics.The result shows that the grain growth exponent of Ti-B20 alloy is in the range of 0.33-0.35 which is close to the theoretical value of 0.5,while that of Ti-B20-0.1B alloy is quite small which is in the range of 0.049-0.052.The calculation result shows that the activation energy of Ti-B20-0.1B alloy is much higher than that of Ti-B20 alloy.When the long axis of TiB whisker in titanium alloy containing boron parallels to the grain boundary,the TiB whisker has more significant restrictive effect on the grain growth.更多还原