Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip - I. Cyclic deformation response and slip band behavior

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	Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip - I. Cyclic deformation response and slip band behavior
	Z. Wang ; B. Gong ; Z. G. Wang
刊名	Acta Materialia
	1998
卷号	47 期号:1 页码:307-315
关键词	stress-strain response dislocation-structures alpha-brass fatigue alloys cu-16 temperature amplitude
ISSN号	1359-6454
中文摘要	Cyclic deformation behavior of Cu-30% Zn single crystals oriented for single slip was studied at constant plastic shear strain amplitudes (gamma(pl)) in the range of 3.8 x 10(-5)-6.4 x 10(-3) in order to understand systematically the fundamental fatigue behavior of low stacking fault energy materials. Results indicate that the cyclic hardening behavior strongly depends on the strain amplitude applied. For low strain amplitudes (gamma(pl) <3 x 10(-4)), cyclic saturation occurred after an initial cyclic hardening stage, but for high strain amplitudes (gamma(pl) greater than or equal to 6.0 x 10(-4)) saturation could not be reached until fatigue failure. The initial cyclic hardening rate (theta(0.2)) was found to decrease with increase in the applied strain amplitude. Slip bands were found to behave very similarly to Luders band appearance at the beginning as well as in the middle stage of cyclic deformation. Particularly, the similarity of the cyclic hardening behavior at low and high strain amplitudes to the work hardening response in stages I and II of tensile deformation of the same alloy has been pointed out. Cyclic stress was further decomposed into two terms, the effective stress and the internal stress, and both were found to increase continuously with cyclic deformation. It has been demonstrated that the activities of secondary slips played an important role in the continuous cyclic hardening at high gamma(pl). A comparison of the present result with previous relevant work on both wavy and planar slip materials has been attempted. The transition of wavy slip mode to planar slip mode of Cu-Al and Cu-Zn alloys has been discussed in terms of the electron-atom ratio and the critical Value of the ratio for such a transition is found to be 1.18-1.19 for both alloys. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
原文出处	://WOS:000077996000029
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37815]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Wang,B. Gong,Z. G. Wang. Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip - I. Cyclic deformation response and slip band behavior[J]. Acta Materialia,1998,47(1):307-315.
APA	Z. Wang,B. Gong,&Z. G. Wang.(1998).Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip - I. Cyclic deformation response and slip band behavior.Acta Materialia,47(1),307-315.
MLA	Z. Wang,et al."Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip - I. Cyclic deformation response and slip band behavior".Acta Materialia 47.1(1998):307-315.