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Characterisation of manganese-containing intermetallic particles and corrosion behaviour of die cast Mg-Al-Based alloys
Luleå tekniska universitet.
Research Centre Porsgrunn, Norsk Hydro ASA.
Research Centre Porsgrunn, Norsk Hydro ASA.
Magnesium Market Development, Hydro Magnesium, 39209 Six Mile Rd., Ste. 200, Livonia.
2000 (English)In: Magnesium technology 2000: proceedings of the symposium / sponsored by the Light Metals Division of the Minerals, Metals and Materials Society (TMS) and the International Magnesium Association held during the 2000 TMS Annual Meeting in Nashville, Tennessee, March 12 - 16, 2000 / [ed] Howard I. Kaplan, Warrendale, Penn: Minerals, Metals & Materials Society, 2000, 153-160 p.Conference paper (Refereed)
Abstract [en]

Manganese is used to remove iron from molten magnesium alloys in order to produce high purity alloys. A study of manganese-containing particles in the magnesium alloys is therefore of technological significance with regard to the corrosion properties of Mg-Al-based alloys. TEM/SEM investigations of the as-cast microstructure and the corrosion morphologies revealed that the corrosion resistance of the alloys studied is dependent on (1) the distribution and types of small Mn-containing particles where corrosion pits can form to initiate corrosion fissures, and (2) the barrier effects for the propagation of fissures in the alloys. Two types of manganese-containing phases were found in the alloys. Type I is a flower-shaped phase, and Type II is of equiaxed or short-bar morphologies. The type II particles have a lower Al/Mn ratio and a much higher cathodic reaction rate than the Type I phase. The Type II particles may provide sites to form pits and initiate corrosion fissures. The segregated regions of higher Al content adjacent to the grain boundaries and the β-Al12Mg17 particles may act as barriers to the propagation of corrosion fissures.

Place, publisher, year, edition, pages
Warrendale, Penn: Minerals, Metals & Materials Society, 2000. 153-160 p.
Research subject
Material Mechanics
URN: urn:nbn:se:ltu:diva-34624ScopusID: 34588807Local ID: 8dea78b0-6f67-11db-962b-000ea68e967bISBN: 0-87339-466-6 (print)OAI: diva2:1007875
TMS Annual Meeting : 12/03/2000 - 16/03/2000
Godkänd; 2000; 20060921 (cira)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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