The contributions of grain size, dislocation density and twinning to the strength of a magnesium alloy processed by ECAP

✍ Scribed by Levente Balogh; Roberto B. Figueiredo; Tamás Ungár; Terence G. Langdon

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 434 KB
• Volume: 528
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2010.09.048

✦ Synopsis

A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes at 473 K and the evolution of strength and microstructural parameters were determined using hardness testing and X-ray line profile analysis. The results show the subgrain size and twin boundary density increase between 1 and 2 passes and then decrease, the dislocation density continuously decreases up to 8 passes and the measured microhardness remains reasonably constant between 1 and 8 passes of ECAP. The results are interpreted using a model based on the additive effects of the dislocation density and an average size factor incorporating the effects of both the twin and the subgrain boundaries.