期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141305
关键词
Magnesium-lithium alloy; Duplex microstructure; Ductility; In situ neutron diffraction
类别
资金
- US National Science Foundation [DMR 1809640, DMR 1809696]
- National Key Research and Development Project of China [2018YFE0115800]
- Center for Materials Processing at the University of Tennessee
- Scientific User Facilities Division, Office of Basic Energy Sciences
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
Through real-time neutron diffraction measurements, it was found that the enhanced ductility of duplex Mg-Li alloys is attributed to the early yield of BCC beta-Li phase and the sequential activation of basal and pyramidal a slip systems in HCP alpha-Mg phase, which promotes overall work hardening rate and relieves Mises constraint for deformation compatibility. No obvious twinning activities were observed, resulting in symmetric hysteresis loops during a full loading cycle within +/- 1% applied strain.
Unlike many Mg alloys that exhibit limited ductility, duplex Mg-Li alloys possess enhanced ductility but the underlying mechanisms are unclear. Using real-time in situ neutron diffraction measurements, we show that the underlying deformation modes in this duplex microstructure include an early yield of body-centered-cubic (BCC) beta-Li phase and the later elevated hardening in this phase at large macroscopic plastic strain, and the sequential activation of basal and pyramidal a slip systems in hexagonal-close-packed (HCP) alpha-Mg phase. The latter relieves the Mises constraint for deformation compatibility, and the successive yielding sequence promotes the overall work hardening rate, both of which are beneficial for ductility enhancement. No obvious twinning activities were found and correspondingly the hysteresis loops were symmetric upon a full loading cycle within +/- 1% applied strain.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据