| Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression | |
| X. B. Xu; Z. Ling; X. Wu; Y. L. Bai | |
| 2002 | |
| Source Publication | Journal of Materials Science & Technology
 |
| ISSN | 1005-0302 |
| Volume | 18Issue:6Pages:504-508 |
| Abstract | The localized shear deformation in the 2024 and 2124 Al matrix composites reinforced with SiC particles was investigated with a split Hopkinson pressure bar (SHPB) at a strain rate of about 2.0x10(3) s(-1). The results showed that the occurrence of localized shear deformation is sensitive to the size of SiC particles. It was found that the critical strain, at which the shear localization occurs, strongly depends on the size and volume fraction of SiC particles. The smaller the particle size, the lower the critical strain required for the shear localization. TEM examinations revealed that Al/SiCp interfaces are the main sources of dislocations. The dislocation density near the interface was found to be high and it decreases with the distance from the particles. The Al matrix in shear bands was highly deformed and severely elongated at low angle boundaries. The Al/SiCp interfaces, particularly the sharp corners of SiC particles, provide the sites for microcrack initiation. Eventual fracture is caused by the growth and coalescence of microcracks along the shear bands. It is proposed that the distortion free equiaxed grains with low dislocation density observed in the center of shear band result from recrystallization during dynamic deformation. |
| description.department | chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, inst mech, lab nonlinear mech continuous media, beijing 100080, peoples r china. wayne state univ, dept mech engn, detroit, mi 48202 usa.;xu, xb (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china |
| Keyword | Al/sicp Composites Shear Localization Recrystallization Dislocations Band Formation Deformation Recrystallization Alloy |
| URL | 查看原文 |
| WOS ID | WOS:000179670900007 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/36477 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | X. B. Xu,Z. Ling,X. Wu,et al. Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression[J]. Journal of Materials Science & Technology,2002,18(6):504-508. |
| APA | X. B. Xu,Z. Ling,X. Wu,&Y. L. Bai.(2002).Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression.Journal of Materials Science & Technology,18(6),504-508. |
| MLA | X. B. Xu,et al."Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression".Journal of Materials Science & Technology 18.6(2002):504-508. |
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