The role of liquid phase in cavitation in a Si{sub 3}N{sub 4p}/Al-Mg-Si composite exhibiting high-strain-rate superplasticity

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00404-1· OSTI ID:524534

Iwasaki, H ^[1]; Mabuchi, M ^[2]; Higashi, K ^[3]

---

1. Himeji Inst. of Tech., Hyogo (Japan). Dept. of Materials Science and Engineering
2. National Industrial Research Inst. of Nagoya (Japan)
3. Univ. of Osaka Prefecture, Sakai, Osaka (Japan). Dept. of Mechanical Systems Engineering

Cavitation was quantitatively investigated at 8 MPa and 833 K for a high-strain-rate superplastic Si{sub 3}N{sub 4}/Al-Mg-Si composite, where the testing temperature of 833 K was slightly above the onset temperature for partial melting. Most of the cavities were very small ({le}1 {micro}m), and cavity development was not significant. Based on a theoretical analysis, when stress concentrations around reinforcements are relaxed by the presence of a liquid phase, excessive cavity development is suggested to be limited. This view is in agreement with the experimental results.

• Sponsoring Organization: Ministry of Education, Science and Culture (Japan); Department of the Army, Washington, DC (United States)
• OSTI ID: 524534
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 7 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CAVITIES
COMPOSITE MATERIALS
LIQUID METALS
MAGNESIUM ALLOYS
NUCLEATION
PLASTICITY
SILICON ALLOYS
SILICON NITRIDES
STRAIN RATE
STRESSES
TEMPERATURE RANGE 0400-1000 K