Primary phase growth and microstructure evolution of rapidly solidifying ternary Ti-12Al-8V alloy
Primary phase growth and microstructure evolution of rapidly solidifying ternary Ti-12Al-8V alloy
复制标题
快凝三元Ti-12Al-8V合金初生相生长及组织演变
DOI：
10.1016/j.matlet.2016.04.043
复制
发表时间：
2016
影响因子：
3
通讯作者：
Geng L.
中科院分区：
文献类型：
--
作者：
Wei S. L.;Huang L. J.;Chang J.;Zhai W.;Yang S. J.;Geng L.
采用电磁悬浮和落管技术对液态Ti-12Al-8V合金进行了快速凝固。悬浮处理避免了初生β相的剧烈非均匀形核，实际最大过冷度为212K(0.11Tl)。初生β枝晶的生长速度高达14.9m/S，但随后转变为篮状编织结构。落管实验表明，过冷度和冷却速度的共同影响决定了最终的组织形态。当冷却速度超过3.31×103K/S时，初生相β在室温下仍处于亚稳状态。
Liquid Ti-12Al-8V alloy was rapidly solidified by electromagnetic levitation and drop tube techniques. The levitation processing avoided the violent heterogeneous nucleation of primary β phase and led to an actual maximum undercooling of 212 K (0.11TL). The primary β dendrites exhibited a high growth velocity up to 14.9 m/s but subsequently transformed into basket weave structures. Drop tube experiments indicated that the final microstructure morphology was determined by the coupled influences of undercooling extent and cooling rate. If the cooling rate exceeded 3.31×103K/s, the primary β phase was retained metastably to ambient temperature.