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利用KKSO三维多相场模型,在等层片宽度和厚度条件下,研究了CBr_4-C_2Cl_6共晶合金在不同初始层片间距条件下的三维形态演化过程、层-棒转变及三维层片间距调整机制,研究表明,对于亚共晶、共晶成分的CBr_4-C_2Cl_6合金,不同的初始层片间距可能导致共晶形态发生层-棒转变,且发生层-棒转变的趋势与初始层片间距的大小有关;而过共晶成分的CBr_4-C_2Cl_6合金不会发生层-棒转变,维持层片生长.而且当无量纲初始层片间距在0.598—2.336之间变化时,随着层片间距的增加,其演化顺序为:层片湮没后形成1λO→T-xλO→1λO→2λO→分叉与形核→Z字型分叉→无序组织.研究还表明,三维层片间距调整机制与二维层片间距调整机制类似,基本机制为层片湮没和层片分叉.当初始层片间距较小时,发生层片湮没现象.而当初始层片间距较大时,层片发生分叉.但由于多了第三方向的限制作用,三维层片间距调整机制比二维复杂.
Using KKSO three-dimensional multi-phase field model, the three-dimensional morphological evolution, the layer-rod transition and the three-dimensional layer spacing adjustment of CBr_4-C_2Cl_6 eutectic alloy under different initial layer spacing were studied under the condition of the same layer width and thickness Mechanism, the study shows that for the eutectic, eutectic composition of CBr_4-C_2Cl_6 alloy, different initial layer spacing may lead to eutectic morphological layer - rod transformation, and the tendency of the layer - rod transition with the initial layer spacing Size, while the hypereutectic composition of CBr_4-C_2Cl_6 alloy layer-rod transition does not occur to maintain the growth of ply and when the non-dimensional initial ply spacing varies between 0.598-2.336, with the spacing of the ply , The order of evolution is that the lamellae form 1λO → T-xλO → 1λO → 2λO → bifurcation and nucleation → Z-shape bifurcation → disordered structure after the annihilation of the lamella.It also shows that the adjusting mechanism of three-dimensional lamellar spacing is similar to the two- The mechanism of interlayer spacing adjustment is similar to that of the principle of layer annihilation and layer bifurcation. When the initial layer spacing is small, the layer annihilation occurs, while when the initial layer spacing is large, the layer bifurcation occurs. Due to the third party’s restrictive effect, Three-dimensional layer spacing adjustment mechanism than the two-dimensional complex.