Title :
Effects of Sr on the microstructure and performance of Mg-Al alloy
Author :
Gang Feng ; Huashun Yu
Author_Institution :
State Grid of China Technol. Coll., Shandong Electr. Power Coll., Jinan, China
Abstract :
Effects of micro alloying element Sr on the microstructure and mechanical performance of Mg-Al alloy were studied in this paper. X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) were employed to analyze and observe the microstructure of the alloy. It was found that accompanying with the addition content of Sr from 0.01 to 0.1wt%, the grain size of Mg-3wt%Al alloy decreased from 120-160μm to 50-80μm, proving that the addition of Sr could refine the microstructure obviously. At the same time, the mechanical properties were measured to find that the tensile strength increased from 147.77MPa to 183.25MPa after aging treatment and the Vickers hardness increased from 85 to 102. The room-temperature fracture morphology of Mg-3wt%Al alloy with 0.1wt%Sr appeared as low ductile sockets and narrow sidesteps. The refinement and enhancement mechanisms of addition Sr were also analyzed in this paper.
Keywords :
Vickers hardness; X-ray diffraction; ageing; alloying additions; aluminium alloys; ductile fracture; grain size; magnesium alloys; optical microscopy; scanning electron microscopy; strontium alloys; tensile strength; MgAlSr; SEM; Vickers hardness; X-ray diffraction; XRD; aging; ductile sockets; grain size; mechanical properties; microalloying element; microstructure; optical microscopy; room-temperature fracture morphology; scanning electron microscopy; strontium alloying addition; temperature 293 K to 298 K; tensile strength; Aging; Magnesium; Microstructure; Morphology; Resistance; Strontium; Mg-Al alloy; mechanical properties; microalloying; microstructure;
Conference_Titel :
Electronic and Mechanical Engineering and Information Technology (EMEIT), 2011 International Conference on
Conference_Location :
Harbin, Heilongjiang
Print_ISBN :
978-1-61284-087-1
DOI :
10.1109/EMEIT.2011.6024101
