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Plastic-Strain-Amplitude Dependence of Dislocation Structures in Cyclically Deformed aOE (c) 112 >-Oriented Cu-7 at. pct Al Alloy Single Crystals
X. W. Li; N. Peng; X. M. Wu; Z. G. Wang
2014
Source PublicationMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN1073-5623
Volume45AIssue:9Pages:3835-3843
AbstractDislocation structures in Cu-7 at. pct Al alloy single crystals cyclically deformed at different plastic strain amplitudes were investigated by transmission electron microscope (TEM) and compared with the results of Cu single crystals. It is found that the plastic strain amplitude gamma (pl) has an obvious effect on the slip deformation mode, and consequently on the cyclic hardening behavior of Cu-7 at. pct Al alloy single crystals with an intermediate stacking fault energy. For instance, a high slip planarity (i.e., only formation of planar-slip bands) contributes to the occurrence of a gentle cyclic hardening with a much lower saturation stress at a low gamma (pl) of 4.5 x 10(-4). A mixed planar/wavy-slip mode (e.g., persistent Luder's bands/wall-like microstructures) at an intermediate gamma (pl) of 2.2 x 10(-3) causes an obvious cyclic hardening up to a comparable saturation stress to that for the Cu single crystal. In contrast, the deformation mode is dominated by wavy slip (e.g., ill-defined dislocation cells and walls) at the highest gamma (pl) of 7.2 x 10(-3), causing that its cyclic hardening curve is quite similar to that for the Cu single crystal; in this case, a slightly higher saturation stress level than that for the Cu single crystal is reached due to the additional solid solution strengthening.
description.department[li, x. w. ; peng, n.] northeastern univ, coll sci, inst mat phys & chem, shenyang 110819, peoples r china. [li, x. w.] northeastern univ, key lab anisotropy & texture mat, minist educ, shenyang 110819, peoples r china. [wu, x. m.] northeast elect power res inst co ltd, shenyang 110006, peoples r china. [wang, z. g.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; li, xw (reprint author), northeastern univ, coll sci, inst mat phys & chem, pob 104, shenyang 110819, peoples r china. ; xwli@mail.neu.edu.cn
KeywordSlip Mode Modification Fcc Solid-solutions Deformation-behavior Orientation Dependence Fatigue Damage Planar-slip Copper Stress Sem
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73287
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
X. W. Li,N. Peng,X. M. Wu,et al. Plastic-Strain-Amplitude Dependence of Dislocation Structures in Cyclically Deformed aOE (c) 112 >-Oriented Cu-7 at. pct Al Alloy Single Crystals[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2014,45A(9):3835-3843.
APA X. W. Li,N. Peng,X. M. Wu,&Z. G. Wang.(2014).Plastic-Strain-Amplitude Dependence of Dislocation Structures in Cyclically Deformed aOE (c) 112 >-Oriented Cu-7 at. pct Al Alloy Single Crystals.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,45A(9),3835-3843.
MLA X. W. Li,et al."Plastic-Strain-Amplitude Dependence of Dislocation Structures in Cyclically Deformed aOE (c) 112 >-Oriented Cu-7 at. pct Al Alloy Single Crystals".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 45A.9(2014):3835-3843.
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