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논문 기본 정보

자료유형
학술저널
저자정보
Hyungsoo Lee (Pohang University of Science and Technology) Jin Hyeok Choi (Pohang University of Science and Technology) Min Chul Jo (Pohang University of Science and Technology) 조일국 (Korea Institute of Materials Science) 이상관 (한국기계연구원부설 재료연구소) Sunghak Lee (Pohang University of Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.4
발행연도
2018.1
수록면
894 - 903 (10page)

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A 7075 Al alloy matrix composite reinforced with SiC particulates (SiC p s) whose sizes were 10 and 30 μm, i.e., a bimodalAl–SiC p composite, was made by a liquid pressing process, and its quasi-static and dynamic compressive properties wereevaluated by using a universal testing machine and a split Hopkinson pressure bar, respectively. Mg–Si-, Al–Fe-, and Curichintermetallic compounds existed inside the Al matrix, but might not deteriorate compressive properties because of theirlow volume fraction (about 2.6%) which was much lower than that of SiC p . The dynamic compressive strength was higherthan the quasi-static strength, and was higher in the specimen tested at 2800 s −1 than in the specimen tested at 1400 s −1according to the strain-rate hardening. For explaining the strain data, the blocking extent of crack propagation by the Almatrix was quantitatively examined. The melting of Al matrix occurred by adiabatic heating was favorable for the improvementin compressive strain because it favorably worked for activating the shear band formation and for blocking the crackpropagation, thereby leading to the excellent compressive strain (10.9–11.6%) as well as maximum compressive strength(1057–1147 MPa). Thus, the present bimodal 7075 Al–SiC p composite provides a promise for new applications to highperformancearmor plates.

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