Microfracture behavior of Al-SiC composites under dynamic loading
- Korea Inst. of Machinery and Materials, Changwon (Korea, Republic of). Materials Engineering Dept.
- Seoul National Univ. (Korea, Republic of). Div. of Materials Science and Engineering
- Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advanced Aerospace Materials
The aim of the present study is to gain a more fundamental understanding of how the microfracture processes are affected by loading rate. Dynamic void initiation tests were performed using circumferentially notched tensile specimens at a strain rate of (about) 10{sup 3}/s at room temperature. The micromechanical processes involved in void initiation and microcrack development were elucidated by sectioning the tested specimens and examining the highly strained regions just beneath the fracture surfaces. To understand the effect of strain rate on the evolution of damage and on the failure of these materials, the same composites were quasistatically tested at a strain rate of 5 {times} 10{sup {minus}4}/s, and the same postfracture examination procedures used on the dynamically loaded specimens were performed. The materials used in this study were powder-processed 2124 and 2009 aluminum alloy matrix composites reinforced with 7 or 15 vol pct SiC whiskers (SiC{sub 2}) or SiC particulates (SiC{sub p}): 2124 Al-7 vol pct SiC{sub w}, 2124 Al-15 vol pct SiC{sub 2}, 2009 Al-15 vol pct SiC{sub 2}, and 2009 Al-15 vol pct SiC{sub p}.
- OSTI ID:
- 543492
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 28; ISSN MMTAEB; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- English
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