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

Volume

9

fYear

2011

fDate

12-14 Aug. 2011

Firstpage

4763

Lastpage

4765

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/EMEIT.2011.6024101

Filename

6024101