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

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• 作者：Levente Balogh ; Roberto B. Figueiredo ; Tamá ; s Ungá ; r ; Terence G. Langdon
• 关键词：Dislocation density ; Equal-channel angular pressing ; Magnesium alloy ; Twinning ; X-ray line profile analysis
• 刊名：Materials Science and Engineering: A
• 出版年：2010
• 出版时间：25 November 2010
• 年：2010
• 卷：528
• 期：1
• 页码：533-538
• 全文大小：433 K

文摘

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.