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本文采用类金属透明模型合金丁二腈-23.6 wt%樟脑(SCN-23.6 wt%DC)合金,研究了棒状共晶定向凝固组织的演化行为,考察了抽拉速度对棒状共晶合金组织形貌演化的影响规律.结果表明,在共晶生长初期,共晶组织首先起源于晶粒晶界或者试样盒型壁处,随后沿液/固界面和平行于热流方向生长;在较小的抽拉速度(0.064—0.44μm/s)下,棒状共晶界面前沿呈现平界面形态,内部两相棒状组织平行生长,并且随着抽拉速度的增大,棒状共晶逐渐细化,棒状间距减小;而在较大的抽拉速度(0.67—1.56μm/s)下,共晶界面前沿呈现胞状生长形貌,胞内的棒状共晶呈放射状生长,同样,随着抽拉速度的增大,胞内棒状共晶逐渐细化,棒状间距减小.
In this paper, the evolution behavior of rod-shaped eutectic oriented solidified microstructure was investigated by using a metal-free transparent alloy of butadiene-23.6 wt% camphor (SCN-23.6 wt% DC). The effects of drawing speed on the morphology, The results show that during the initial eutectic growth, the eutectic structure first originates at the grain boundaries or at the wall of the sample box, and then grows along the liquid / solid interface and parallel to the heat flow direction. In the case of smaller pumping At the pull rate (0.064-0.44μm / s), the front edge of the rod-like eutectic interface presents a flat interface and the two-phase rod-like structure grows in parallel. With the increase of the drawing speed, the rod- While at the larger drawing speed (0.67-1.56μm / s), the frontier of eutectic interface showed a cellular growth morphology, and the intracellular rod-shaped eutectic grew radially. Similarly, with the increase of drawing speed , Intracellular cocrystal gradually refined, rod-shaped spacing decreases.