Understanding on the Role of Rare Earth Elemets in Activation of < c plus a > Slip in Magnesium: An Atomistic Approach

HS Jang and KH Kim and NJ Kim and BJ Lee, MAGNESIUM TECHNOLOGY 2017, 491-495 (2017).

DOI: 10.1007/978-3-319-52392-7_67

The effect of Li addition on the slip behavior of Mg has been investigated using a molecular dynamics simulation. Based on a previous study on Mg-Y alloys concluding that a reduction of the anisotropy in critical resolved shear stress (CRSS) among difference slip systems activates the < c + a > slip, the effect of Li, an element known to improve the room temperature ductility of Mg is chosen as an alloying element to examine the robustness of the above-mentioned conclusion. It is found that Li increases the CRSS of the basal slip more than that of the non-basal slip, reducing the difference in the CRSS among different slip systems. The reduced anisotropy in CRSS is believed to activate the non-basal < c + a > slip and eventually improve ductility in Mg Li alloys. This understanding can be further extended into an alloy design of more cost-effective Mg alloys with improved room temperature formability.

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