Microstructural refinement mechanism by controlling heating process in multiphase materials with particular reference to γ-TiAl
Microstructural refinement mechanism by controlling heating process in multiphase materials with particular reference to γ-TiAl
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DOI：
10.1063/1.2190076
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发表时间：
2006-03
影响因子：
4
通讯作者：
Hanliang Zhu;K. Maruyama;J. Matsuda
中科院分区：
文献类型：
--
作者：
Hanliang Zhu;K. Maruyama;J. Matsuda
以TiAl合金为例，研究了通过控制加热速度来细化组织的机理。TiAl合金在α+γ双相场中加热时，发生了γ向α的相变。升温速度的提高使过热程度增大，驱动力增大，α相的形核率增大。在较高的升温速率下，大量的α晶核形成并拉长，导致后续冷却后α2/γ细小的片层组织。对一种全层状Ti-48Al合金的实验结果验证了理论预测。
The microstructural refinement mechanism by controlling heating rate was investigated in TiAl alloys as an example of multiphase materials. During heating in the α+γ dual phase field of TiAl alloys, the phase transformation of γ to α takes place. The increase in heating rate raises the extent of superheating, leading to increases in driving force and the nucleation rate of the α phase. At higher heating rate, numerous α nuclei form and lengthen, resulting in a fine α2∕γ lamellar microstructure after subsequent cooling. The theoretical prediction was demonstrated by the experimental results obtained on a fully lamellar Ti-48Al alloy.