Influence of temperature on segregation in 2009 Al-SiC{sub w} composite and its implication on high strain rate superplasticity

Journal Article · Mon Jul 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00118-2· OSTI ID:276179

Mishra, R S; Mukherjee, A K ^[1]; Echer, C ^[2]; Bampton, C C ^[3]; Bieler, T R ^[4]

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1. Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
2. Lawrence Berkeley Lab., CA (United States). National Center for Electron Microscopy
3. Rockwell Science Center, Thousand Oaks, CA (United States)
4. Michigan State Univ., East Lansing, MI (United States). Dept. of Materials Science and Mechanics

A number of aluminum matrix composites exhibit high strain rate superplasticity. Two experimental features stand out. First, the optimum strain rates for superplasticity are > 1 {times} 10{sup {minus}1} s{sup {minus}1}, significantly higher than conventional superplastic strain rates of 10{sup {minus}4}--10{sup {minus}3} s{sup {minus}1}. Second, a correlation exists between the temperature at which the maximum superplastic elongation is observed and the incipient melting temperature. This has led to some debate on the mechanism of high strain rate superplasticity. To investigate the role of ceramic reinforcement on the segregation at high temperatures, the authors have conducted the following experiments: (a) the effect of prior thermomechanical processing on high strain rate superplasticity, and (b) the influence of temperature on segregation by carrying out analysis during in-situ heating in a transmission electron microscope (TEM). This work was carried out on a 2009 Al-SiC{sub w} composite.

• OSTI ID: 276179
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 35; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
DIFFERENTIAL THERMAL ANALYSIS
INTERMETALLIC COMPOUNDS
MAGNESIUM ALLOYS
MELTING
PHASE TRANSFORMATIONS
PLASTICITY
SEGREGATION
SILICON ADDITIONS
SILICON CARBIDES
SOLUBILITY
TEMPERATURE DEPENDENCE
THERMOMECHANICAL TREATMENTS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY