亚快速单向凝固晶体生长的非稳态演化  

NON-STEADY EVOLUTION OF SUBHIGH RATE UNIDIRECTIONAL SOLIDIFICATION

作　　者：傅恒志[1] 王祖锦[1] 

机构地区：[1]西北工业大学,厦门叉车总厂

出　　处：《材料研究学报》1996年第3期253-258,共6页Chinese Journal of Materials Research

摘　　要：晶体生长中的非稳态演化过程一直是凝固领域人们很少涉及的课题，尤其在胞枝转变之后相当宽范围的亚快速凝固更是少人问津，而非稳态过程对材料最终的组织形态往往产生重大影响．本文采用有机物模拟合金研究了低速及亚快速凝固范围界面形态与一次间距的演化规律，并初步探讨了其演化机制．Non-steady state evolution of crystal growth is still a problem seldom concerned by people in solidification,particular in the region of subhigh growth velocity after cell to dendrite transition. However,the final microstructure of materials is affected significantly by the non-steady state solidification process.The present paper is dealing with an investigation on the evolution of interface morphologies and the primary spacing of crystals at low and subhigh growth velocity and its evolution mechanism.The results show that the evolution characteristics of various interface morphologies,such as cells and dendrites,obtained under different solidification conditions and the mechanism of dynamic adjustment of primary spacing during non-steady state process are different.

关 键 词：非稳态凝固 一次间距 形态演化 晶体生长 合金 

分 类 号：TG111.4[金属学及工艺—物理冶金] TG13[金属学及工艺—金属学]