ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mg-Al-Zn alloys containing 0.5% Ca were strip cast into sheets with a thickness of about1.0mm by twin roll caster. It is found that the addition of Ca to Mg95Al5-XZnX (wt%)alloys preventsthe oxidation and burning of molten, and makes the melting and casting easy. The as-castMg96Al4Zn0.5Ca0.5 alloy sheet has few cracks at the edge. With increasing Zn content, the generation ofcracks occurs more markedly. The as-cast alloys have equiaxed grains with an average grain size of 10μm. A fine microstructure is obtained. All the samples consist of single hcp-Mg phase. The yield andultimate tensile strength of the as-cast sheets are in the range of 180 to 200 MPa and 265 to 275MPa, respectively. The alloy Mg95Al2Zn2.5Ca0.5 shows an elongation of 21% as well as a high strength of275 MPa. The annealing at 400 ℃ causes an improvement of elongation to 24% and 30% forMg96Al4Zn0.5Ca0.5 and Mg95Al2Zn2.5Ca0.5,respectively. A further enhancement of mechanicalproperties is expected by an appropriate thermomechanical treatment. The as-cast Mg96Al4Zn0.5Ca0.5sheet was deep drawn at 250℃ and a drawing ratio of 2.0 without cracking . In summery, the Caadded Mg alloys are suitable for the production of Mg alloy sheets by strip casting and the cast alloysheet have high strength with ductility and good formability
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1747.pdf
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