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The Effect of Equal Channel Angular Pressing on Coarsening Kinetics of AZ80–0.2Y–0.15Ca Alloy in Semisolid State
Advanced Engineering Materials ( IF 3.6 ) Pub Date : 2020-07-30 , DOI: 10.1002/adem.202000415
Lingling Fan 1 , Mingyang Zhou 2 , Lingbao Ren 3 , Houyi Li 4 , Hongtao Zhang 1 , Tianhui Lu 1 , Chongliang Liu 1 , Gaofeng Quan 1
Affiliation  

Semisolid samples of the AZ80–0.2Y–0.15Ca wt% (AZ80M) magnesium alloy are fabricated using equal channel angular pressing (ECAP) followed by semisolid isothermal heating treatment. The effect of the number of ECAP passes on the coarsening dynamics of the alloy at different semisolid temperatures is investigated. The results show that as the number of ECAP passes increases, the coarsening rate constant (K) shows a similar trend downward and then upward at different temperatures. And the K value of the sample after three passes of ECAP processing (3P) is the lowest, which is primarily attributed to the maximum proportion of high‐angle grain boundaries (HAGBs) and the most uniform grain size in the 3P sample. At high solid fractions, a high proportion of HAGBs hinders the coalescence of the adjacent solid grains. At low solid fractions, uniform and fine grains result in insufficient driving force for the Ostwald ripening process. These lead to the lowest K value in the 3P sample.

中文翻译:

等通道角挤压对半固态AZ80–0.2Y–0.15Ca合金粗化动力学的影响

AZ80–0.2Y–0.15Ca重量%(AZ80M)镁合金的半固态样品是使用等通道角挤压(ECAP)然后进行半固态等温热处理制成的。研究了不同半固态温度下,ECAP通过次数对合金粗化动力学的影响。结果表明,随着ECAP通过次数的增加,粗化速率常数(K)在不同温度下呈现相似的下降趋势,然后上升。和K经过3次ECAP处理(3P)后,样品的值最低,这主要归因于3P样品中高角度晶界(HAGB)的最大比例和最均匀的晶粒尺寸。在高固体含量下,高比例的HAGB会阻碍相邻固体颗粒的聚结。在低固体含量下,均匀而细小的晶粒会导致Ostwald熟化过程的驱动力不足。这些导致3P样本中的最低K值。
更新日期:2020-07-30
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