Effects of Sr and B addition on microstructure and mechanical properties of AZ91 magnesium alloy

The effects of Sr and B addition on the microstructure and mechanical properties of AZ91 alloy were studied. The results of this work show that a small amount of Sr addition to AZ91 refined the grain size. The highest tensile strength was obtained from the alloy with the optimal composition of 0.5%...

Full description

Saved in:
Bibliographic Details
Published inJournal of materials research Vol. 22; no. 9; pp. 2423 - 2428
Main Authors Zhao, H.L., Guan, S.K., Zheng, F.Y.
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 01.09.2007
Subjects
Microstructure
Microstructure
Mg
Sr
Online AccessGet full text

Cover

More Information
Summary:The effects of Sr and B addition on the microstructure and mechanical properties of AZ91 alloy were studied. The results of this work show that a small amount of Sr addition to AZ91 refined the grain size. The highest tensile strength was obtained from the alloy with the optimal composition of 0.5% Sr and 0.09% B added, in which the average grain size was 42 μm. The tensile strength and elongation of the AZ91–0.5%Sr–0.09%B alloy were 151 MPa and 1.62%, respectively. Some needle-shaped Al4Sr particles distributed mainly at grain boundaries have been observed in the alloys with Sr and B additions. The fluidity is improved significantly, and the solidification range decreased by adding Sr and B. The liquidus of AZ91 alloy decreased markedly with the addition of Sr and B, but the solidus hardly changed. Therefore, the solidification range can be decreased, which will improve the die-casting properties.
Bibliography:ArticleID:03650
PII:S0884291400036505
ark:/67375/6GQ-ZJKNSQJS-S
istex:C31271FCA0B7B81558E0CA05A408C184A69A5399
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2007.0331