On the microsegregation of Ti–45Al–(8–9)Nb–(W, B, Y) alloy
On the microsegregation of Ti–45Al–(8–9)Nb–(W, B, Y) alloy
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DOI：
10.1016/j.matlet.2006.04.115
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发表时间：
2007
影响因子：
3
通讯作者：
X. J. Xu;Junpin Lin;Zhenke Teng;Y. L. Wang;G. Chen
中科院分区：
文献类型：
--
作者：
X. J. Xu;Junpin Lin;Zhenke Teng;Y. L. Wang;G. Chen
研究了铸态高Nb TiAl合金显微偏析的形貌、分布和来源，以及显微偏析对锻态和热处理显微组织的影响。结果表明，初生β晶粒边界处、层状集落三联结处、层状集落内部存在三种微偏析，分别为L-偏析、β-偏析和α-偏析。由于高冷却速率和低原子扩散速率，在合金凝固和相变过程中形成偏析。在(α+γ)区域锻造后，β偏析和α偏析可以消除，但L偏析无法消除。 L-偏析不利于锻造材料的热处理。
The morphology, distribution and origin of microsegregation of an as-cast high Nb containing TiAl alloy and the effect of the microsegregation on as-forged and heat-treated microstructures had been investigated. The results showed that there were three kinds of microsegregations, designated as L-segregation, β-segregation and α-segregation, existing on boundaries of primary β grains, on triple junctions of lamellar colonies, within lamellar colonies, respectively. The segregations were formed during solidification and phase transformation of the alloy due to high cooling rate and low atom diffusion rate. After forging in (α+γ) region β-segregation and α-segregation could be eliminated after, but L-segregation could not be eliminated. L-segregation was detrimental to heat treatment of the as-forged material.