Bhat, Radhakrishna BV and Mahajan, YR and Roshan, HMd and Prasad, YVRK (1993) Processing maps for hot-working of powder metallurgy 1100 Al-10 vol % SiC-particulate metal-matrix composite. In: Journal of Materials Science (full set), 28 (8). pp. 2141-2147.
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The hot-working characteristics of the metal-matrix composite (MMC) Al-10 vol % SiC-particulate (SiCp) powder metallurgy compacts in as-sintered and in hot-extruded conditions were studied using hot compression testing. On the basis of the stress-strain data as a function of temperature and strain rate, processing maps depicting the variation in the efficiency of power dissipation, given by eegr = 2m/(m+1), where m is the strain rate sensitivity of flow stress, have been established and are interpreted on the basis of the dynamic materials model. The as-sintered MMC exhibited a domain of dynamic recrystallization (DRX) with a peak efficiency of about 30% at a temperature of about 500Â°C and a strain rate of 0.01 sï¿½1. At temperatures below 350°C and in the strain rate range 0.001ï¿½0.01 sï¿½1 the MMC exhibited dynamic recovery. The as-sintered MMC was extruded at 500°C using a ram speed of 3 mm sï¿½1 and an extrusion ratio of 10ratio1. A processing map was established on the extruded product, and this map showed that the DRX domain had shifted to lower temperature (450°C) and higher strain rate (1 sï¿½1). The optimum temperature and strain rate combination for powder metallurgy billet conditioning are 500°C and 0.01 sï¿½1, and the secondary metal-working on the extruded product may be done at a higher strain rate of 1 sï¿½1 and a lower temperature of 425Â°C.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Springer.|
|Department/Centre:||Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)|
|Date Deposited:||23 Feb 2011 04:39|
|Last Modified:||23 Feb 2011 04:39|
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