| Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates | |
| Zhang, Xuezheng1,2; Chen, Tijun1; Ma, Siming2; Qin, He1; Ma, Jinyuan3 | |
| Corresponding Author | Chen, Tijun(chentj@lut.cn) |
| 2021-02-01 | |
| Source Publication | COMPOSITES PART B-ENGINEERING
 |
| ISSN | 1359-8368 |
| Volume | 206Pages:15 |
| Abstract | The trade-off between strength and ductility of particulate reinforced metal matrix composites (PRMMCs) has been a longstanding puzzle. Here we propose an effective strategy to surmount the inverse relationship between strength and ductility of an A356 Al alloy based PRMMC by in situ synthesizing novel reinforcing particulates with a special core-shell (CS) structure. Such structure features a Ti core inside a dual-layer shell: the inner layer has a nano-grained (similar to 130 nm) heterogeneous structure, and the outer layer possesses a composite structure composed of a (Al,Si)(3)Ti substrate with dense dispersion of nanoparticles. As a result, the obtained composite reinforced with such CS reinforcing particulates (CS composite) achieves an unprecedented tensile elongation to failure of 8.3 +/- 0.8% and a uniform elongation of 7.1 +/- 0.6%, which nearly triples that of the same alloy based composite reinforced with monolithic (Al,Si)(3)Ti particulates (monolithic composite) and equivalent to corresponding matrix alloy while maintaining high ultimate tensile strength of 373 +/- 8.8 MPa and yield strength of 268 +/- 7.9 MPa, equivalent to monolithic composite simultaneously. This special architecture of shell renders itself a high capability of stress bearing and good toughness, and the nanoparticles in outer layer further slower crack development, which significantly postpone crack formation in shell. Subsequent propagation of cracks in Ti core is also constrained remarkably by the transformation-induced plasticity effect occurred ahead of crack tips resulting from stress-induced phase transformation of hcp-Ti into fcc-Ti. These factors lead to highest work hardening rate that undergoes a long plateau and thus overcome the strength-ductility trade-off of A356 alloy based PRMMC. |
| Keyword | Metal matrix composites Core-shell structure Toughening mechanism Strengthening mechanism |
| Funding Organization | National Natural Science Foundation of China ; Basic Scientific Fund of Gansu Universities ; Program for Hongliu Outstanding Talents of Lanzhou University of Technology |
| DOI | 10.1016/j.compositesb.2020.108541 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51564035] ; Basic Scientific Fund of Gansu Universities[G2014-07] ; Program for Hongliu Outstanding Talents of Lanzhou University of Technology[2012-03] |
| WOS Research Area | Engineering ; Materials Science |
| WOS Subject | Engineering, Multidisciplinary ; Materials Science, Composites |
| WOS ID | WOS:000600593500007 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/158720 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Chen, Tijun |
| Affiliation | 1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China 2.Purdue Univ, Sch Engn Technol, 401 N Grant St, W Lafayette, IN 47906 USA 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China |
| Recommended Citation GB/T 7714 | Zhang, Xuezheng,Chen, Tijun,Ma, Siming,et al. Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates[J]. COMPOSITES PART B-ENGINEERING,2021,206:15. |
| APA | Zhang, Xuezheng,Chen, Tijun,Ma, Siming,Qin, He,&Ma, Jinyuan.(2021).Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates.COMPOSITES PART B-ENGINEERING,206,15. |
| MLA | Zhang, Xuezheng,et al."Overcoming the strength-ductility trade-off of an aluminum matrix composite by novel core-shell structured reinforcing particulates".COMPOSITES PART B-ENGINEERING 206(2021):15. |
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