|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Limit of Grain Refinement after Processing by a Combination of Severe Plastic Deformation Techniques
||Shima Sabbaghianrad, Seyed Alireza Torbati-Sarraf, Terence G. Langdon
|On-Site Speaker (Planned)
An Al-7075 aluminum alloy and a ZK60 magnesium alloy were processed by a combination of equal-channel angular pressing (ECAP) for 4 passes and high-pressure torsion (HPT) through total numbers of up to 20 turns. Processing by ECAP and HPT were performed at 473 K and room temperature, respectively. Mechanical tests revealed an increase in the hardness value of the Al-7075 alloy after the combination of ECAP and HPT. However, this value was decreased for the ZK60 magnesium alloy. Microstructural images of the Al-7075 alloy show significant grain refinement after a combination of ECAP and HPT compared to individual processing techniques. However, the average grain size in ZK60 alloy was larger after processing by the two-step SPD technique compared to only HPT processing. This investigation is focused on grain refinement for materials processed by a combination of ECAP and HPT.
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