Chemical interaction processes at the interface between mild steel and liquid magnesium of technical grade
- Univ. Claude Bernard Lyon 1, Villeurbanne (France). Lab. des Multimateriaux et Interfaces
Under the constraints of reducing both motor-fuel consumption and air pollution, weight saving is becoming a major requirement in the automotive industry. A way presently under investigation to meet this requirement consists in replacing, whenever possible, the aluminum alloys commonly used for the manufacture of many cast pieces ({rho} = 2.7--2.9 g.cm{sup {minus}3}) by magnesium alloys of lower specific weight ({rho} = 1.7--1.9 g.cm{sup {minus}3}). In the liquid state, magnesium and its alloys are almost universally processed using iron or steel crucibles, pipes, pumps and molds. This is justified by the fact that no intermetallic compound exists in the Fe-Mg binary system and that the mutual solubilities between the two metals are very low: according to Massalski, the solubility at 1,000 K of Mg in solid Fe is negligible and that of Fe in liquid Mg is of about 0.04 wt.% (0.018 at.%). This excellent chemical compatibility may however be altered by the presence of impurities or addition elements in the two base metals and the authors have undertaken a general study to evaluate the nature and extent of the changes thus induced. The present work reports the results of a first approach aimed to investigate the chemical behavior of mild steel substrates when exposed for a long time to liquid magnesium of technical grade.
- OSTI ID:
- 361742
- Journal Information:
- Scripta Materialia, Vol. 40, Issue 10; Other Information: PBD: 23 Apr 1999
- Country of Publication:
- United States
- Language:
- English
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