摘要
以Al-K2ZrF6为反应体系,采用Al热还原法,研究了不同工艺参数对Al-Zr中间合金凝固过程中初生Al3Zr相的形貌、尺寸、数量及分布状态的影响.结果表明:随着熔体反应温度的增加,Al3Zr晶体的形貌由小块状逐渐长成长条状,尺寸增加,数量减少;当温度低于1 000℃,晶体呈现小块状;温度高于1 000℃时,晶体呈现长条状;温度为1 000℃时,晶体呈现块状和长条状的混合态.与使用铁模相比,采用耐火材料模时,Al3Zr相尺寸增大,数量减小.随着K2ZrF6加入量的增加,Al3Zr相的体积分数增多,尺寸更细小,分布更均匀.
The effects of processing parameters on the morphology, size, amount and distribution of the primary A13Zr phase during the solidification of AI-Zr master alloys were investigated by the aluminothermic reduction method in the A1-K2ZrF6 reaction system. The results showed that the morphologies of the primary Al3Zr crystals transformed from the small blocky shape to long strip shape, and the size of the primary AI3Zr increased while their amount decreased, with the increase of the molten reaction temperature. When the reaction temperature was below 1 000 （2, A13Zr crystals exhibited small blocky shapes; when the temperature was higher than 1 000 ℃, they displayed long strip shapes; when temperature was 1 000 ~（2, they displayed the small blocky and long strip mixed morphologies. The sizes of the A13Zr became larger and the amounts of them became fewer in the refractory mold in comparison to that in the iron mold. With the increase of the K2ZrF6 content, the volume fraction of A13Zr phase increased gradually, and these crystals grew much finer and with more uniform distribution in the A1 matrix.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第12期1739-1742,1791,共5页
Journal of Northeastern University(Natural Science)
基金
国家重点基础研究发展计划项目(2012CB619506)
国家自然科学基金资助项目(51201029,51204053)
中国博士后科学基金资助项目(2012M520637)
