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Title: Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip. 1: Cyclic deformation response and slip band behavior

Abstract

Cyclic deformation behavior of Cu-30% Zn single crystals oriented for single slip was studied at constant plastic shear strain amplitudes ({gamma}{sub pi}) in the range of 3.8 {times} 10{sup {minus}5}--6.4 {times} 10{sup {minus}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}{sub pi} < 3 {times} 10{sup {minus}4}), cyclic saturation occurred after an initial cyclic hardening stage, but for high strain amplitudes ({gamma}{sub pi} {ge} 6.0 {times} 10{sup {minus}4}) saturation could not be reached until fatigue failure. The initial cyclic hardening rate ({theta}{sub 0.2}) was found to decrease with increase in the applied strain amplitude. Slip bands were found to behave very similarly to Jueders 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 tomore » 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}{sub pi}. 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.« less

Authors:
;  [1];  [2]
  1. Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science
  2. Chinese Academy of Science, Shenyang (China). State Key Lab. for Fatigue and Fracture
Publication Date:
OSTI Identifier:
328288
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 47; Journal Issue: 1; Other Information: PBD: 11 Dec 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; FATIGUE; COPPER ALLOYS; ZINC ALLOYS; MONOCRYSTALS; STRESSES; STRAINS; DEFORMATION; SLIP; HARDENING

Citation Formats

Wang, Z, Gong, B, and Wang, Z G. Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip. 1: Cyclic deformation response and slip band behavior. United States: N. p., 1998. Web. doi:10.1016/S1359-6454(98)00302-4.
Wang, Z, Gong, B, & Wang, Z G. Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip. 1: Cyclic deformation response and slip band behavior. United States. https://doi.org/10.1016/S1359-6454(98)00302-4
Wang, Z, Gong, B, and Wang, Z G. 1998. "Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip. 1: Cyclic deformation response and slip band behavior". United States. https://doi.org/10.1016/S1359-6454(98)00302-4.
@article{osti_328288,
title = {Cyclic deformation behavior of Cu-30 wt% Zn single crystals oriented for single slip. 1: Cyclic deformation response and slip band behavior},
author = {Wang, Z and Gong, B and Wang, Z G},
abstractNote = {Cyclic deformation behavior of Cu-30% Zn single crystals oriented for single slip was studied at constant plastic shear strain amplitudes ({gamma}{sub pi}) in the range of 3.8 {times} 10{sup {minus}5}--6.4 {times} 10{sup {minus}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}{sub pi} < 3 {times} 10{sup {minus}4}), cyclic saturation occurred after an initial cyclic hardening stage, but for high strain amplitudes ({gamma}{sub pi} {ge} 6.0 {times} 10{sup {minus}4}) saturation could not be reached until fatigue failure. The initial cyclic hardening rate ({theta}{sub 0.2}) was found to decrease with increase in the applied strain amplitude. Slip bands were found to behave very similarly to Jueders 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}{sub pi}. 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.},
doi = {10.1016/S1359-6454(98)00302-4},
url = {https://www.osti.gov/biblio/328288}, journal = {Acta Materialia},
number = 1,
volume = 47,
place = {United States},
year = {Fri Dec 11 00:00:00 EST 1998},
month = {Fri Dec 11 00:00:00 EST 1998}
}