The formation of Sr 6.33Mg 16.67Si 13 in magnesium alloy AM50 and its effect on mechanical properties
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In: Journal of Materials Science, Vol. 47, No. 14, 07.2012, p. 5461-5469.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - The formation of Sr 6.33Mg 16.67Si 13 in magnesium alloy AM50 and its effect on mechanical properties
AU - Fechner, Daniel
AU - Hort, Norbert
AU - Blawert, Carsten
AU - Dieringa, Hajo
AU - Störmer, Michael
AU - Kainer, Karl Ulrich
PY - 2012/7
Y1 - 2012/7
N2 - The increasing use of magnesium castings for automotive components and the number of newly developed alloys raise the question of suitable recycling processes. Remelting offers a high potential of energy saving and thereby improves the live cycle balance of magnesium components. Effective recycling processes are likely to involve the mixing of different alloys but little is known about the interaction of alloying elements. In order to approach this issue, the influence of strontium, silicon and calcium on phase formation and mechanical properties of magnesium alloy AM50 has been investigated. After strontium addition, X-ray diffraction demonstrated the formation of the Al4Sr and the Mg 17Sr 2 phases. However, after simultaneous alloying with strontium, silicon and calcium the ternary Zintl phase Sr 6.33Mg 16.67Si 13 was detected. This phase forms preferably instead of Al 4Sr,Mg 17Sr 2 andMg 2Si. Compared to the two strontium-containing phases, precipitates of the ternary Zintl phase exhibit a rather compact morphology. This results in a higher elongation-at-fracture under tensile stress.
AB - The increasing use of magnesium castings for automotive components and the number of newly developed alloys raise the question of suitable recycling processes. Remelting offers a high potential of energy saving and thereby improves the live cycle balance of magnesium components. Effective recycling processes are likely to involve the mixing of different alloys but little is known about the interaction of alloying elements. In order to approach this issue, the influence of strontium, silicon and calcium on phase formation and mechanical properties of magnesium alloy AM50 has been investigated. After strontium addition, X-ray diffraction demonstrated the formation of the Al4Sr and the Mg 17Sr 2 phases. However, after simultaneous alloying with strontium, silicon and calcium the ternary Zintl phase Sr 6.33Mg 16.67Si 13 was detected. This phase forms preferably instead of Al 4Sr,Mg 17Sr 2 andMg 2Si. Compared to the two strontium-containing phases, precipitates of the ternary Zintl phase exhibit a rather compact morphology. This results in a higher elongation-at-fracture under tensile stress.
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84861093869&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/c983f1b3-c91e-3079-96aa-283445473745/
U2 - 10.1007/s10853-012-6436-9
DO - 10.1007/s10853-012-6436-9
M3 - Journal articles
AN - SCOPUS:84861093869
VL - 47
SP - 5461
EP - 5469
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 14
ER -