Mechanical properties and failure characteristics of cast and extruded Mg97Y2Zn1 alloys with LPSO phase

Okayasu, Mitsuhiro, Takeuchi, Shuhei, Matsushita, Masafumi, Tada, Naoya, Yamasaki, Michiaki and Kawamura, Yoshihito (2016) Mechanical properties and failure characteristics of cast and extruded Mg97Y2Zn1 alloys with LPSO phase. Materials Science and Engineering A, 652 14-29. doi:10.1016/j.msea.2015.11.069


Author Okayasu, Mitsuhiro
Takeuchi, Shuhei
Matsushita, Masafumi
Tada, Naoya
Yamasaki, Michiaki
Kawamura, Yoshihito
Title Mechanical properties and failure characteristics of cast and extruded Mg97Y2Zn1 alloys with LPSO phase
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2016-01-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.msea.2015.11.069
Open Access Status Not Open Access
Volume 652
Start page 14
End page 29
Total pages 16
Publisher Elsevier
Language eng
Formatted abstract
Mechanical properties and failure characteristics of Mg97Y2Zn1 (at%) alloys, prepared by gravity casting and extrusion processes, are examined experimentally. High tensile and fatigue strengths are obtained for extruded Mg97Y2Zn1 alloys, with the values being approximately twice as high as those for cast Mg97Y2Zn1 alloys. Such high strengths are attributed to the high internal stress arising from the complicated microstructure and severe lattice strain in the α-Mg and long-period stacking order phases. On the other hand, a high fracture strain is obtained for cast Mg97Y2Zn1 alloy, which is affected not only by the lower internal stress, but also severe kink deformation. The failure characteristics, e.g., crack growth characteristics are examined via direct observation during tensile and fatigue tests at micro- and nano-scales. Meandering fatigue crack growth is obtained for the cast Mg97Y2Zn1 alloys. The mean roughness of the fracture surface for cast Mg97Y2Zn1 alloys is more than twice as high as that for commercially available AM60 and AZ91 cast alloys. A coarse fracture surface that was observed in the cast Mg97Y2Zn1 alloys would make severe roughness-induced crack closure, leading to high fatigue strength.
Keyword Crack growth characteristic
Failure analysis
Long-period stacking order phase
Magnesium alloy
Mechanical property
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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