Effect of orientations on in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys

IMR OpenIR

	Effect of orientations on in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys
	P. Li; B. M. Zhou; Y. Z. Zhou; J. G. Li; T. Jin; X. F. Sun; Z. F. Zhang
	2014
发表期刊	Philosophical Magazine
ISSN	1478-6435
卷号	94 期号:21 页码:2426-2446
摘要	After systematically investigating in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys with four different orientations, their slip and fracture modes in relation to the orientations are obtained and shown as follows. In [001] oriented specimen, four slip systems were activated and the crack initiated along the interactive location between the third slip bands (SBs) and deformation bands in priority. The crack propagation involves all three crack opening types of I, II and III. [011] oriented specimens exhibited obvious low strain hardening rate and high ductility, which can be attributed to the balance between the softening caused by the propagation of SBs and the latent hardening caused by the propagation of deformation bands. Except for case, the critical resolved shear stress (CRSS) of the other oriented superalloys at room temperature is approximate, which is due to non-Schmid behaviour in superalloys. Lall-Chin-Pope model is used to explain the orientation dependence of CRSS. Furthermore, the fracture modes of different oriented specimens depend on the intensity of intrusion and extrusion and the degree of match between normal stress and shear stress. The shear stress is beneficial to the crack initiation and the normal stress contributes to the crack propagation.
部门归属	[li, p. ; zhou, b. m. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [zhou, y. z. ; li, j. g. ; jin, t. ; sun, x. f.] chinese acad sci, inst met res, superalloy div, shenyang 110016, peoples r china. ; li, p (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; pli@imr.ac.cn ; tjin@imr.ac.cn
关键词	Single-crystal Superalloy Orientation Slip Bands (Sbs) Fracture In Situ Tension Fatigue-crack Growth Ll2 Ordered Alloys Yield-stress Temperature-dependence Creep-behavior Asymmetry Slip Anisotropy
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73278
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Li,B. M. Zhou,Y. Z. Zhou,et al. Effect of orientations on in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys[J]. Philosophical Magazine,2014,94(21):2426-2446.
APA	P. Li.,B. M. Zhou.,Y. Z. Zhou.,J. G. Li.,T. Jin.,...&Z. F. Zhang.(2014).Effect of orientations on in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys.Philosophical Magazine,94(21),2426-2446.
MLA	P. Li,et al."Effect of orientations on in situ tensile deformation and fracture behaviours of nickel-base single-crystal superalloys".Philosophical Magazine 94.21(2014):2426-2446.