Understanding the High Strength and Good Ductility in LPSO-Containing Mg Alloy Using Synchrotron X-ray Diffraction
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MG alloys have gained increasing attention as candidate material for structural applications due to their high specific strength. On the other hand, the low absolute strength and poor ductility at room temperature remain a bottleneck for the widespread use of Mg.[1] Mg-Y-Zn alloys that contain a long-period stacking-ordered (LPSO) structure have been found to possess both high strength and good ductility compared with many other Mg alloys.[2–4] The LPSO structure is
JIE WANG, LEYUN WANG, GAOMING ZHU, BIJIN ZHOU, TAO YING, and HAIYAN JIANG are with the National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China. Contact e-mail: [email protected] XINGMIN ZHANG is with the Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China. QI HUANG and YAO SHEN are with the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. XIAOQIN ZENG is with the National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University and also with the State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University. Contact e-mail: [email protected] Manuscript submitted March 13, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
both chemically and structurally ordered, with Y and Zn atoms occupying specific sites in the Mg lattice.[5,6] To understand the excellent mechanical properties, deformation of LPSO-containing Mg alloys has been investigated in recent years. Shao et al.[7] studied the deformation microstructure of a Mg97Y2Zn1 (at. pct) alloy after hot compression. They proposed that the interface between Mg and LPSO phases provides resistance against catastrophic fracture of the material. Hagihara et al.[8] examined the deformation microstructure of a directionally solidified Mg88Zn5Y7 alloy after compression at room temperature. They found that basal slip was the dominant deformation mode in the LPSO phase. Kinking was also observed as a complementary deformation mechanism to accommodate local deformation in LPSO. In a recent work, Kim et al.[9] observed both basal hai dislocations and pyramidal hc+ai dislocations in the Mg phase in a cold-rolled Mg97Y2Zn1 alloy. Non-basal hai slip was also observed in the LPSO phase in an extruded Mg97Y2Zn1 alloy after tensile deformation.[10] So far, most studies on the deformation of LPSO-containing Mg alloys were conducted using post-deformation samples by electron microscopy.[4–18] To fully understand the excellent combination of strength and ductility in this type of material, in situ tests are more
desirable. Synchrotron X-ray, due to its ability to penetrate bulk materials non-destructively, is a powerful tool for in situ studies of material deformation.[19,20] Among numerous synchrotron X-ray characterization techniques, X-ray diffraction (XRD) is particularly useful for understanding the structure–property relationship in engineering materials via various in situ experiments. It allows for quantitative
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