Influence of yttrium on the high temperature deformability of TiAl alloys
Influence of yttrium on the high temperature deformability of TiAl alloys
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DOI：
10.1016/j.msea.2007.09.093
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发表时间：
2009-01-15
期刊：
影响因子：
6.4
通讯作者：
Li, B. H.
中科院分区：
文献类型：
--
作者：
Kong, F. T.;Chen, Y. Y.;Li, B. H.
采用等温热压成形的方法，研究了添加钇对TiAl合金塑性变形性能和变形后组织变化的影响。实验采用Gleeble-1500D型热力模拟机进行。结果表明：变形温度越高、应变速率越低，当添加0.3 at时，其变形抗力越小；在相同的工艺参数下，%Y能显著提高Ti-43Al-9V和Ti-45Al-5Nb合金的热变形性能。与无y TiAl合金变形后的显微组织相比，含y TiAl合金的晶粒尺寸更细，动态再结晶形成的细小等轴γ晶粒的比例增加，0.3 at的添加量增加；%Y降低了Ti-43Al-9V和Ti-45Al-5Nb的变形激活能（数值为）。%)合金。根据等温热压缩结果，提出了适合现有含y TiAl合金的变形工艺参数。所推荐的热变形工艺参数已成功用于（0.3%）含y TiAl合金方坯的准等温罐装锻造。爱思唯尔B.V.版权所有
The effects of yttrium additions on plastic deformability and the change of microstructures after deformation of TiAl alloys were investigated by isothermal hot-compression pressing. The experiments were conducted with the Gleeble-1500D style of thermo-force analogue machine. The results indicated that the higher the deformation temperature and the lower the strain rate, the smaller the deformation resistance, and adding 0.3 at.%Y can improve remarkably hot deformability of Ti-43Al-9V and Ti-45Al-5Nb alloys at the same processing parameters. Comparing with the microstructures of Y-free TiAl alloys after deformation, the grain sizes of Y-containing TiAl alloys were much finer and the fraction of the fine equiaxed gamma grains formed by dynamic recrystallization increased, and the addition of 0.3 at.%Y decreased the now stress, the deformation activation energy of Ti-43Al-9V and Ti-45Al-5Nb (numbers indicate at.%) alloys. According to the isothermal hot-compression pressing results, appropriate sets of deformation processing parameters are recommended for the present Y-containing TiAl alloys. These recommended hot deformation processing parameters have been successfully used for the quasi-isothermal canned forging of (0.3%)Y-containing TiAl alloy billets. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.