Microstructure refinement via martensitic transformation in TiAl alloys

Microstructure refinement via martensitic transformation in TiAl alloys
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TiAl 合金中通过马氏体相变细化微观结构

DOI:
10.1016/j.jallcom.2018.01.216
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发表时间:
2018-04
影响因子:
6.2
通讯作者:
Liang Yongfeng
Liang Yongfeng
中科院分区:
材料科学2区
文献类型:
--
作者:
Chen Lin;Lin Junpin;Xu Xiangjun;Li Chan;Xu Yong;Liang Yongfeng

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利用马氏体相变从β相区快速淬火细化高铌TiAl合金的显微组织。β稳定元素Cr、V的加入促进了β→α马氏体相变。Ti-42.5Al-6 Nb-x(Cr,V)合金中马氏体的形态和晶体学特征表明,马氏体α相与母相β相具有理想的Burgers取向关系,马氏体的横向尺寸随β稳定元素的增加而减小。通过后续热处理,可以获得一系列细化的全片层(FL)和近片层(NL)组织,其中FL团尺寸可达30 μm,2at.% Cr和50 μm,3原子% V分别。
Martensitic transformations are utilized to refine the microstructure of high Nb containing TiAl alloys by rapid quenching from β phase region. Additions of β stabilizing elements, such as Cr and V, are verified to promote the β→α martensitic transformation. The morphologic and crystallographic characteristics of martensites in Ti-42.5Al-6Nb-x(Cr, V) alloys indicate that the martensitic α has a perfect Burgers orientation relationship with the parent β phase, and the lateral size of the martensite decreases with increment of β stabilizing elements. With subsequent heat treatment, a series of refined fully lamellar (FL) and nearly lamellar (NL) microstructures can be obtained, where the FL colony size can reach 30 μm with 2 at.% Cr and 50 μm with 3 at.% V respectively.
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