Non-equilibrium basal stacking faults in hexagonal close-packed metals

Non-equilibrium basal stacking faults in hexagonal close-packed metals
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六方密排金属中的非平衡基底堆垛层错

DOI:
10.1016/j.actamat.2015.02.036
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发表时间:
2015-05
期刊:
影响因子:
9.4
通讯作者:
Liu, Q.
Liu, Q.
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang, X. Y.;Li, B.;Liu, Q.

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进行透射电子显微镜(TEM)研究以研究变形的六方密堆积(HCP)金属中的非平衡基底堆垛层错(SF),镁(Mg)、钴(Co)、钛(Ti)和Mg AZ31合金。这些SF呈现比由部分位错产生的基底SF的平衡宽度宽两到三个数量级的宽度。非平衡基底SFs通常产生于形变孪晶内部,在常规TEM中,SFs呈现与基面轨迹对齐的直线形态,并且可能穿过整个孪晶。为了研究SFs的形成机制,我们进行了原子模拟。模拟结果表明,非平衡基底SFs的形成与非相干孪晶界(TB)迁移密切相关。当初始TB的结构不连贯时,基底SF成核,一端锚定在移动TB上。SF随后随着移动的TB沿着生长,导致SF具有可能穿过整个双晶的大宽度。SFs的形核和生长过程中不存在Shockley或Frank部分位错。当初始TB的结构是相干或接近相干时,不生成SF。非平衡基底SF与棱柱滑移和棱锥滑移相互作用,阻碍位错滑移。
Transmission electron microscopy (TEM) studies were performed to investigate non-equilibrium basal stacking faults (SFs) in deformed hexagonal, close-packed (HCP) metals, i.e., magnesium (Mg), cobalt (Co), titanium (Ti) and a Mg AZ31 alloy. These SFs present a width that is two to three orders of magnitude wider than the equilibrium width of the basal SFs created by partial dislocations. The non-equilibrium basal SFs are often generated inside deformation twins, and in conventional TEM the SFs present a morphology of straight lines well aligned with the trace of the basal planes, and may cross a whole twin. To investigate the mechanism of the formation of the SFs, we performed atomistic simulations. The simulation results show that the formation of the non-equilibrium basal SFs is closely associated with incoherent twin boundary (TB) migration. When the structure of the initial TB is incoherent, basal SFs are nucleated with one end being anchored at the moving TB. SFs subsequently grow along with the moving TB, resulting in SFs with a large width that may cross the whole twin. No Shockley or Frank partial dislocations are involved in the nucleation and the growth of SFs. When the structure of the initial TB is coherent or nearly coherent, no SFs are generated. The non-equilibrium basal SFs interact with prismatic and pyramidal slips, and impede the dislocation slip.
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