中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 6 June 2025 |
（1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract:A statistical analysis of the twinning behavior in a basal-textured Mg sheet under hard orientation loading was performed at strain rates of 1×10-5 and 1×10-1 s-1 with grain sizes of 70 and 20 μm. There were 1609 tension twins identified including adequate (51%) anomalous twins (Schmid factor m<0). Twin variant selection exhibited almost no grain size or strain rate effects. Most twin variants (74%) correlated well with the proposed normalized Schmid factor (mnor). The Luster-Morris parameter (m′) values failed to correlate with the twin transmission, while 96% of transmitted pairs exhibited large mnor or normalized m′ (m′nor) values. Twin transmission occurred more frequently at lower grain boundary misorientation angles (10°-30°). The active anomalous twins correlated well with m of the prismatic slip. The present work provided a statistical perspective that, the mnor and m′nor can correlate the anomalous twinning rather than m and m′. The local condition also played a critical role in anomalous twinning behavior.
Key words: Mg; anomalous twin; twin transmission; Schmid factor; Luster-Morris parameter
