Tensile and High Cycle Fatigue Properties of a Minor Boron-Modified Ti-22Al-11Nb-2Mo-1Fe Alloy

被引:8
作者
Hagiwara, M. [1 ]
Kitaura, T. [1 ]
Ono, Y. [2 ]
Yuri, T. [2 ]
Ogata, T. [2 ]
Emura, S. [2 ]
机构
[1] Kyushu Inst Technol, Res Ctr Adv Ecofitting Technol, Kitakyushu, Fukuoka 8080196, Japan
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
关键词
alpha(2) titanium alloy; boron addition; microstructure refinement; ductility; high cycle fatigue; BETA-TITANIUM-ALLOYS; CREEP-BEHAVIOR; MECHANICAL-PROPERTIES; MICROSTRUCTURE; PHASE; REFINEMENT; ADDITIONS; MO;
D O I
10.2320/matertrans.M2012043
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The Ti3Al (alpha(2) phase)-based Ti-22Al-11Nb-2Mo-1Fe (in at%) alloy is a derivative of Ti2AlNb (0 phase)-based orthorhombic Ti-22Al-27Nb (in at%) and was designed to reduce Nb content and thereby material cost. In the present study, two microstructure modification methods, a minor addition of boron (B) and a thermo-mechanical treatment in the (B2 + alpha(2)) two-phase region, were applied to refine the microstructure of this alloy and thus to improve its ductility. The prior B2 grain size of the as-cast ingot was drastically reduced, from 600-1000 to 100-200 mu m with the addition of 0.1 mass% B, and thereby a refined full lamellar microstructure was obtained. The duplex microstructure consisting of spherical alpha 2 phases and lamellar microstructure area was formed by the thermo-mechanical treatment, which was much finer in the B-modified alloy than in the B-free alloy. The B-modified alloy with a refined full lamellar or duplex microstructure showed higher tensile ductility, as well as higher high cycle fatigue strength and superior creep properties compared to those of the B-free counterpart. The fatigue crack initiated neither from the TiB/matrix interface nor from the TiB itself, but rather from the matrix area of the alloy. Thus, it was confirmed that the addition of a small amount of B exerts a favorable effect as a whole on the mechanical properties of the present Ti-22Al-11Nb-2Mo-1Fe alloy. [doi:10.2320/matertrans.M2012043]
引用
收藏
页码:1138 / 1147
页数:10
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