A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si

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	A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si
	Lu, B; Yang, R; Cui, YY; Li, D
刊名	METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
	2000-09-01
卷号	31 期号:9 页码:2205-2217
ISSN号	1073-5623
通讯作者	Lu, B()
英文摘要	A comparative study has been made of the room- and elevated-temperature tensile properties, room-temperature fracture toughness, fatigue-crack propagation rates, and 650 degrees C creep properties of Ti-24Al-14Nb-3V-0.5Mo with and without 0.9 at. pet Si. Both alloys have microstructures consisting of the alpha(2), B2, and the orthorhombic O phase, with different proportions of the alpha(2) phase relative to the (O + B2) mixtures, depending on solution-treatment temperature. The alloy with a Si addition contains additional primary zeta-Ti5Si3 particles distributed in the (O + B2) matrix. Tests of mechanical properties showed that the incorporation of a small fraction (about 0.03 by volume) of the Ti5Si3 phase lends to greater room-temperature and elevated-temperature strengths, but lower room-temperature elongations and fracture toughness as compared with the base alloy. Alloys containing greater volume fractions of the alpha(2) phase exhibited better tensile ductility and this was attributed to the concurrent stabilization of the B2 phase. Examination of tensile-tested and fatigued specimens indicates that the primary failure mode of the alloys, regardless of Si addition, was due to the brittleness of the alpha(2) phase; the silicide particles that debonded from the matrix also contribute to cracking in the monotonic loading mode. Up to a 20 pet improvement in creep-rupture Life was observed in the Si-containing alloys, and this was interpreted in terms of the solute-strengthening effect of Si. While the incorporated Ti5Si3 phase has an unfavorable effect on ductility and room-temperature fracture toughness, the difference in fatigue-crack propagation rates between the alloys with and without Si is minimal. It is concluded that the controlling factor for the fatigue failure in orthorhombic alloys is related to the (alpha(2) + O + B2) microstructure, instead of the Ti5Si3 particles.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	MINERALS METALS MATERIALS SOC
WOS记录号	WOS:000089198300011
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/110725]
专题	金属研究所_中国科学院金属研究所
通讯作者	Lu, B
作者单位	Chinese Acad Sci, Met Res Inst, Titanium Alloy Lab, Shenyang 110015, Peoples R China
推荐引用方式 GB/T 7714	Lu, B,Yang, R,Cui, YY,et al. A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2000,31(9):2205-2217.
APA	Lu, B,Yang, R,Cui, YY,&Li, D.(2000).A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,31(9),2205-2217.
MLA	Lu, B,et al."A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 31.9(2000):2205-2217.