Directional solidification of TiAl-W-Si alloy by electromagnetic confinement of melt in cold crucible

被引:34
作者
Ding, Hongsheng [1 ]
Nie, Ge [1 ]
Chen, Ruirun [1 ]
Guo, Jingjie [1 ]
Fu, Hengzhi [1 ]
机构
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
基金
美国国家科学基金会;
关键词
Titanium aluminides; based on TiAl; Mechanical properties at ambient temperature; Crystal growth; Microstructure; INTERMETALLIC TI-46AL-2W-0.5SI ALLOY; MECHANICAL-PROPERTIES; MICROSTRUCTURAL DEVELOPMENT; RAPID SOLIDIFICATION; GROWTH; OXYGEN; SELECTION; LAMELLAR; PHASE; MO;
D O I
10.1016/j.intermet.2012.07.018
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The directional solidified Ti-46Al-0.5W-0.5Si alloy with lower oxygen content has been performed successfully by electromagnetic confinement of melt within a water-cooling inductive cold crucible device. By varying the growth rate from 0.5 to 1.5 mm/min, the effects of growth rate on primary phase selection and solidification path as well as structure characteristics either in macro- or micro- scale were determined. The results reveal that the alloys will display 13 phase primarily when the peritectic reaction completed at a growth rate of less than 1.0 mm/min, which implies that the brittle lamellae with orientation that is perpendicular to the crystal growth direction might be disappeared accordingly. It is also found that the average columnar grain size decreased from 312 to 126 gm with increasing of the growth rate, which is in balance with the similarity of primary dendrite arm spacing (PDAS) lambda, decreased according to a relationship of lambda proportional to V-0.41. Due to the oxygen content is reduced to a lower degree for individual DS sample, the oxygen stabilizing effect on yielding a phase to participate primarily seems to be retarded to some extent. Thus, by controlling the directional solidification processing with cold crucible, the gamma based fully lamellar dual-phase DS Ti-46Al-0.5W-0.5Si alloy exhibits good combination of tensile properties at ambient temperature, in which it yields more than 479 MPa of yield strength and as much 3.6% in maximum of fracture elongation. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:264 / 273
页数:10
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