Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.
Nano Lett. 2012 Feb 8;12(2):887-92. doi: 10.1021/nl203937t. Epub 2012 Jan 23.
We have revealed the fundamental embryonic structure of deformation twins using in situ mechanical testing of magnesium single crystals in a transmission electron microscope. This structure consists of an array of twin-related laths on the scale of several nanometers. A computational model demonstrates that this structure should be a generic feature at the incipient stage of deformation twinning when there are correlated nucleation events. Our results shed light on the origin of twinning-induced plasticity and transformation toughening, critical to the development of advanced structural alloys with high strength, ductility, and toughness.
我们通过在透射电子显微镜中对镁单晶体进行原位力学测试，揭示了变形孪晶的基本胚胎结构。该结构由纳米级尺度上的孪晶相关薄条阵列组成。计算模型表明，当存在相关形核事件时，这种结构应该是变形孪晶初始阶段的通用特征。我们的研究结果为孪生诱导塑性和相变增韧的起源提供了线索，这对于开发具有高强度、延展性和韧性的先进结构合金至关重要。
