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Wu C, Ma K, Zhang D, Wu J, Xiong S, Luo G, Zhang J, Chen F, Shen Q, Zhang L, Lavernia EJ. Precipitation phenomena in Al-Zn-Mg alloy matrix composites reinforced with B 4C particles. Sci Rep 2017; 7:9589. [PMID: 28852113 PMCID: PMC5575324 DOI: 10.1038/s41598-017-10291-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/07/2017] [Indexed: 11/13/2022] Open
Abstract
To provide insight into precipitation phenomena in age-hardening Al-Zn-Mg(-Cu) matrix composites, an Al 7075 alloy composite reinforced with B4C particles was selected as a model system. The bulk composites were fabricated via plasma activated sintering and followed by a peak aged (T6) heat treatment. Two types of Al matrix zones were identified in the composite: (1) the regions in the vicinity of the matrix/reinforcement interface, defined as “matrix plastic zone” (MPZ) hereafter, and (2) the regions away from the matrix/reinforcement interface, simply defined as matrix hereafter. The precipitation behavior in the MPZ was characterized and compared to that in the matrix. The MPZ contained a high density of dislocations. The number density of GP zones in the MPZ is lower than that in the matrix while the average size of the GP zones in MPZ is coarser. In addition, semi-coherent platelet η′ precipitates were observed but only in the MPZ. The dislocations and the Al/B4C interfaces provide more heterogeneous nucleation sites for the η′ precipitates in the MPZ. The growth and coarsening of the η′ precipitates caused rapid depletion of Mg and Zn solute atoms in the MPZ.
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Affiliation(s)
- Chuandong Wu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China.,Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, CA, 92697, USA
| | - Kaka Ma
- Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, 80523, USA
| | - Dalong Zhang
- Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, CA, 92697, USA.,Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN, 37831, USA
| | - Jialu Wu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Shuya Xiong
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Guoqiang Luo
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jian Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Fei Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Qiang Shen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China.
| | - Lianmeng Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Enrique J Lavernia
- Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, CA, 92697, USA.
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Deschamps A, Niewczas M, Bley F, Brechet Y, Embury JD, Sinq LL, Livet F, Simon JP. Low-temperature dynamic precipitation in a supersaturated AI-Zn-Mg alloy and related strain hardening. ACTA ACUST UNITED AC 1999. [DOI: 10.1080/01418619908214295] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Groma G, Kovács-csetényi E, Kovács I, Lendvai J, Ungár T. The composition of Guinier–Preston zones in Al–Zn–Mg alloys. ACTA ACUST UNITED AC 1979. [DOI: 10.1080/01418617908234866] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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