Microstructure control of Tie45Ale8.5Nbe(W, B, Y) alloy during the solidification process
Microstructure control of Tie45Ale8.5Nbe(W, B, Y) alloy during the solidification process
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Tie45Ale8.5Nbe(W,B,Y)合金凝固过程微观组织控制
DOI：
10.1016/j.actamat.2016.04.021
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发表时间：
2016
期刊：
影响因子：
9.4
通讯作者：
Hengzhi Fu
中科院分区：
文献类型：
--
作者：
Guang Yang;Hongchao Kou;Jieren Yang;Jinshan Li;Hengzhi Fu
本文提出了在凝固过程中采用两步等温处理（TIT）来消除Tisingle键45Al单键8.5Nb单键0.2W单键0.2B单键0.02Y（at.%）合金TIT包括在单一β相区的短期等温处理（1st IT）和略高于β + α转变温度的第二等温处理（2nd IT）。结果表明，未经等温处理（NIT）的凝固组织因Al偏析而不均匀，而经过第一次等温处理后，由于消除了围晶α相，组织均匀性得到改善。TIT可以产生细小均匀的片层组织，没有显微偏析，以及减少织构。此外，还发现TIT可以降低高Nb含量的TiAl合金的开裂倾向。
In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Tisingle bond45Alsingle bond8.5Nbsingle bond0.2Wsingle bond0.2Bsingle bond0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.