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少量TiB晶须对Ti-B20合金β晶粒长大行为的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-09-17
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。
少量TiB晶须对Ti-B20合金β晶粒长大行为的影响Influence of trace TiB whisker on grain growth behavior of β grain in Ti-B20 alloy
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120 min后，Ti-B20-0.1B合金中β晶粒尺寸仅长大了55 μm，而Ti-B20合金晶粒长大了220 μm。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。
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.
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