Microstructure development during directional solidification of Ti–45Al–8Nb alloy

Microstructure development during directional solidification of Ti–45Al–8Nb alloy
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Ti~45Al~8Nb合金定向凝固过程中的微观组织演变

DOI:
10.1016/j.jallcom.2010.06.151
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发表时间:
2010-09
影响因子:
6.2
通讯作者:
--
中科院分区:
材料科学2区
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--
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通过 Ti-45Al-8Nb (at.%) 合金定向凝固 (DS) 过程中的淬火研究显微组织发展和相变。通过调整凝固条件可以控制凝固路线和过程。发现 L+β+α 共存区域的生长速度较低。高温α相是由包晶转变或β→α固态转变或从枝晶间液体直接凝固产生的,由凝固条件确定,并且可以通过检查枝晶区域的β偏析模式来识别。当枝晶间α在包晶形成的α的顶部生长时,实现了层状取向控制。尽管α部分是从初生β枝晶间区域生长出来的,但高温α可以连续排列。 DS 过程中,由于 β-稳定剂集中在枝晶间液体中,产生了一些拉长的 B2 颗粒。 B2 颗粒的体积分数随着生长速率 (V) 的降低而降低。
Microstructure development and phase transition were investigated by quenching during directional solidification (DS) of Ti–45Al–8Nb (at.%) alloy. The solidification route and process can be controlled by adjustment of the solidification condition. A coexisted region of L+β+α was found at a low growth rate. The high temperature α phase, produced by peritectic transformation or β→α solid-state transformation or direct solidification from interdendritic liquid, was determined by the solidification conditions and can be identified by checking the β-segregation pattern in dendritic region. Lamellar orientation control was achieved when the interdendritic α grew on the top of peritectically formed α. High temperature α can be aligned continuously although α partly grew from the region of primary β interdendrite. Some elongated B2 particles were generated due to β-stablizers were centralized in interdendritic liquid during DS process. The volume fraction of the B2 particle decreased with decreasing growth rate (V).
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