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少量TiB晶須對Ti-B20合金β晶粒長大行為的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-17
通過高溫固溶及淬火處理，研究TiB晶須對Ti-B20合金β晶粒長大行為的影響。
少量TiB晶須對Ti-B20合金β晶粒長大行為的影響Influence of trace TiB whisker on grain growth behavior of β grain in Ti-B20 alloy
通過高溫固溶及淬火處理，研究TiB晶須對Ti-B20合金β晶粒長大行為的影響。結果表明：處于晶界的TiB晶須顯著限制了β晶粒的高溫長大，在高于相變點125 ℃固溶120 min后，Ti-B20-0.1B合金中β晶粒尺寸僅長大了55 μm，而Ti-B20合金晶粒長大了220 μm。從動力學角度分析了晶粒長大規律，Ti-B20合金的晶粒長大指數處于0.33~0.35范圍內，接近于理論值0.5；而Ti-B20-0.1B合金的晶粒長大指數非常小，處于0.049~0.052范圍內。計算結果表明：Ti-B20-0.1B合金的激活能顯著高于Ti-B20合金的。含硼鈦合金中TiB晶須長軸平行于晶界時，對晶粒長大的限制作用更顯著。
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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