Cavitation control by static annealing after deformation at a high strain rate of a Si{sub 3}N{sub 4p}/Al-Mg-Si composite

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00648-6· OSTI ID:205241

Iwasaki, Hajime; Yada, Yasuhiro; Mori, Takasuke ^[1]; Mabuchi, Mamoru ^[2]; Higashi, Kenji ^[3]

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1. Himeji Inst. of Technology, Hyogo (Japan)
2. National Industrial Research Inst. of Nagoya (Japan)
3. Osaka Prefecture Univ., Sakai, Osaka (Japan)

It is well established that cavitation occurs during superplastic flow and leads to fracture in a wide range of metals. Recently, it was demonstrated that several aluminum matrix composites with discontinuous SiC or Si{sub 3}N{sub 4} showed superplastic behavior. In particular, some composites showed superplasticity at high strain rates ({le} 10{sup {minus}1} s{sup {minus}1}). More recently, it was shown that cavitation occurred during superplastic deformation for the high-strain-rate superplastic composites. Iwasaki et al. revealed cavitation characteristics of a high-strain-rate superplastic Si{sub 3}N{sub 4p}/Al-Mg-Si composite as follows: (1) cavities were nucleated at matrix/reinforcement interfaces and (2) the sizes of most of cavities were very small ({le} 1 {micro}m). Cavitation control by static annealing is attractive for commercial applications. This paper describes effects of static annealing on cavitation and post-deformation tensile properties in a high-strain-rate superplastic Si{sub 3}N{sub 4p}/Al-Mg-Si composite.

• OSTI ID: 205241
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
DEFORMATION
INTERFACES
LIQUIDS
MAGNESIUM ALLOYS
NUCLEATION
PLASTICITY
POROSITY
SILICON ALLOYS
SILICON NITRIDES
STRAIN RATE
TENSILE PROPERTIES