High-strain-rate superplasticity in aluminum-matrix composites

JOM ◽  
1996 ◽  
Vol 48 (2) ◽  
pp. 52-57 ◽  
Author(s):  
T. R. Bieler ◽  
R. S. Mishra ◽  
A. K. Mukherjee
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites

Critical assessments of accommodation process by liquid phase for superplastic flow in Si3N4/Al–Mg–Si metal matrix composites

1997 ◽  
Vol 12 (9) ◽  
pp. 2332-2336 ◽  
Author(s):  
Mamoru Mabuchi ◽  
Hajime Iwasaki ◽  
Ha-Guk Jeong ◽  
Kenji Hiraga ◽  
Kenji Higashi
Keyword(s):  
Liquid Phase ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Aluminum Matrix ◽  
Critical Conditions ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Stress Concentrations ◽  
Scanning Calorimetry

A liquid phase serves to relax stress concentrations caused by sliding at interfaces and grain boundaries in high-strain-rate superplasticity for aluminum matrix composites. However, the presence of a liquid phase does not always lead to high-strain-rate superplasticity because too much liquid causes decohesion at a liquid phase. The critical conditions of the optimum distribution, thickness, and volume in a liquid phase are discussed based on the observation results by differential scanning calorimetry and transmission electron microscopy. As a result, a very thin and discontinuous liquid phase is required both to assist relaxation of the stress concentrations and to limit decohesion at a liquid phase.

Strain-Rate Relationship of Aluminum Matrix Composites Predicted by Johnson-Cook Model

2011 ◽  
Vol 704-705 ◽  
pp. 935-940
Author(s):  
De Zhi Zhu ◽  
Wei Ping Chen ◽  
Yuan Yuan Li
Keyword(s):  
Strain Rate ◽  
Volume Fraction ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Aluminum Matrix ◽  
Rate Sensitivity ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Hopkinson Pressure Bar ◽  
Cook Model

Strain-rate sensitivities of 55-65vol.% aluminum 2024-T6/TiB2composites and the corresponding aluminum 2024-T6 matrix were investigated using split Hopkinson pressure bar. Results showed that 55-65vol.% aluminum 2024-T6/TiB2composites exhibited significant strain-rate sensitivities, which were three times higher than that of the aluminum 2024-T6 matrix. The strain-rate sensitivity of the aluminum 2024-T6 matrix composites rose obviously with reinforcement content increasing (up to 60%), which agreed with the previous researches. The aluminum 2024-T6/TiB2composites showed hybrid fracture characteristics including particle cracking and aluminum alloy softening under dynamic loading. The flow stresses predicted by Johnson-Cook model increased slowly when the reinforcement volume fraction ranged in 10%-40%. While the reinforcement volume fraction was over 40%, the flow stresses of aluminum matrix composites increased obviously and the strains dropped sharply. Keywords: Composite materials; Dynamic compression; Stress-strain relationship

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