(1. 遼寧工程技術(shù)大學(xué) 材料科學(xué)與工程學(xué)院，阜新 123000；
2. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 通過(guò)高溫固溶及淬火處理，研究TiB晶須對(duì)Ti-B20合金β晶粒長(zhǎng)大行為的影響。結(jié)果表明：處于晶界的TiB晶須顯著限制了β晶粒的高溫長(zhǎng)大，在高于相變點(diǎn)125 ℃固溶120 min后，Ti-B20-0.1B合金中β晶粒尺寸僅長(zhǎng)大了55 μm，而Ti-B20合金晶粒長(zhǎng)大了220 μm。從動(dòng)力學(xué)角度分析了晶粒長(zhǎng)大規(guī)律，Ti-B20合金的晶粒長(zhǎng)大指數(shù)處于0.33~0.35范圍內(nèi)，接近于理論值0.5；而Ti-B20-0.1B合金的晶粒長(zhǎng)大指數(shù)非常小，處于0.049~0.052范圍內(nèi)。計(jì)算結(jié)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(zhǎng)軸平行于晶界時(shí)，對(duì)晶粒長(zhǎng)大的限制作用更顯著。
關(guān)鍵字: 鈦合金；晶粒長(zhǎng)大；TiB；激活能
（1. College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China;
2. College of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
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.
Key words: titanium alloy; grain growth; TiB; activation energy
