Cyclic stress-strain response and surface deformation features of 011 multiple-slip-oriented copper single crystals

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	Cyclic stress-strain response and surface deformation features of 011 multiple-slip-oriented copper single crystals
	X. W. Li; Z. G. Wang; G. Y. Li; S. D. Wu; S. X. Li
	1998
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	46 期号:13 页码:4497-4505
摘要	Cyclic deformation behavior and surface deformation features of [011] multiple-slip-oriented single crystals were investigated at constant plastic shear strain amplitude (gamma(pl)) in the range of 1.1x10(-4)- 7.2 x 10(-3) at room temperature in air. It was revealed that the cyclic deformation characteristic of [011] copper single crystal is quite different from that of [001] and [(1) over bar 11] multiple-slip-oriented copper single crystals. The [011] crystal exhibits a rather low initial hardening rate, which does not increase notably even under higher plastic strain amplitudes. The cyclic stress-strain (CSS) curve of the [011] crystal exhibit a clear plateau region over the range of plastic strain amplitude investigated. Surface observations indicated that the primary persistent slip bands (PSBs) already occur under a lower strain amplitude of 1.1x10(-4), but the operation of secondary slip was strongly suppressed by the corresponding dislocation interactions even at high strain amplitudes. This slip characteristic was suggested to be associated with the occurrence of the plateau region. When gamma(pl)greater than or equal to 2.5 x 10(-3), two types of deformation bands (DBI and DBII) formed on the specimen surface and their habit planes are perpendicular to each other strictly. An analysis based on the classical crystallographic deformation geometry was proposed to interpret the existence of an irreversible rotation of crystal in single crystal subjected to symmetrical push-pull loading. This phenomenon is assumed to be an essential reason for the formation of DBI and DBII. When gamma(pl)greater than or equal to 5.0 x 10(-3) another type of deformation band (DBIII) was observed on the specimen surface and its habit plane is exactly (001) with the maximum shear stress acting on it. The favorable macroscopic state of stress may be responsible for the formation of DBIII, giving rise to the cyclic softening in the cyclically deformed [011] copper single crystals at high strain amplitudes (y(pl) greater than or equal to 5.0 x 10(-3)). (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. Ali rights reserved.
部门归属	acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;li, xw (reprint author), acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china
关键词	Dislocation-structures Fatigue Damage Behavior Amplitude Localization
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37709
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. W. Li,Z. G. Wang,G. Y. Li,et al. Cyclic stress-strain response and surface deformation features of 011 multiple-slip-oriented copper single crystals[J]. Acta Materialia,1998,46(13):4497-4505.
APA	X. W. Li,Z. G. Wang,G. Y. Li,S. D. Wu,&S. X. Li.(1998).Cyclic stress-strain response and surface deformation features of 011 multiple-slip-oriented copper single crystals.Acta Materialia,46(13),4497-4505.
MLA	X. W. Li,et al."Cyclic stress-strain response and surface deformation features of 011 multiple-slip-oriented copper single crystals".Acta Materialia 46.13(1998):4497-4505.