Microstructure evolution and flow behavior of hot-rolled aluminum – 5% B4C composite
| Autor: | S. Gangolu, A.G. Rao, V.P. Deshmukh, Bhagwati Prasad Kashyap, Nityanand Prabhu |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Effective stress Metallurgy Temperature Reinforced Aluminum Composites Strain rate Flow stress Stress Strain-Rate Superplasticity Deformation Stress (mechanics) Mechanical-Behavior Metal-Matrix Composites Creep Alloy Compression (geology) Dislocation Composite material Deformation (engineering) Creep-Behavior Boron-Carbide |
| Zdroj: | Materials & Design. 53:581-587 |
| ISSN: | 0261-3069 |
| DOI: | 10.1016/j.matdes.2013.07.025 |
| Popis: | Differential strain rate compression tests were conducted to study flow behavior of hot rolled Al-5 wt% B4C composite as a function of sample orientation (longitudinal and transverse) over the temperature and strain rate ranges of 25-500 degrees C and 10 (4) to 1 s (1), respectively. The longitudinal samples are found to show lower flow stress than that shown by the transverse samples in the temperature range of 25200 degrees C. The reverse becomes true at higher temperatures of 300-500 degrees C. The values of stress exponent (n) and activation energy for deformation (Q), based on applied stress, ranged from 10 to 46 and 307416 kJ/mol, respectively. However, by considering effective stress, these values were reduced to n = 8 and Q = 126-190 kJ/mol. This stress exponent ofn = 8 is further reduced to n = 5 by considering substructural evolution, which suggests the dislocation climb creep mechanism to be favorable for deformation. (C) 2013 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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