Evaluation of Recycled AZ91D Magnesium Alloy for Steering Column Components

Jacques, Richard P.; DasGupta, Rathindra; Haerle, Andrew G.

doi:10.4271/970332

Cited by 2 publications

(1 citation statement)

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“…As in-house and in-cell recycling is developing (1)(2)(3)(4)(5) one should expect metal cleanliness issues to be of paramount importance. However, until now metal cleanliness has to some extent been a neglected aspect as low cost solutions and smart logistics often have received the main focus (6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Metal Cleanliness on Mechanical Properties of Die Cast Magnesium Alloy AM50

Bakke

Pettersen

Guldberg

et al. 2000

Magnesium Alloys and Their Applications

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IntroductionAs in-house and in-cell recycling is developing (1-5) one should expect metal cleanliness issues to be of paramount importance. However, until now metal cleanliness has to some extent been a neglected aspect as low cost solutions and smart logistics often have received the main focus (6-9). The effect of inclusions on mechanical properties is pronounced and well-known in steels. Properties such as ductility, fatigue, toughness and machinablilty are affected (10-12). Also within the aluminium industry inclusions are of great concern (10). Molten magnesium alloys oxidise more readily than any other metal cast or formed into components used for construction purposes. One might expect this to trig primary producers, end-users as well as researchers interest in quantifying the impact of inclusions on important mechanical properties. However, to our knowledge only a few papers have been published addressing this topic featuring die cast magnesium alloys (13-15). The essence of these papers is that in order to detect any influence of inclusions the content must be really high (at least 0.2 %). This might have lead to the opinion that metal cleanliness represents no obstacle to go ahead with in-house/in-cell recycling. Experimental Test materialStandard die cast test bars were produced from AM50 melts deliberately contaminated with oxide inclusions. AM50 was chosen because this is a highly ductile magnesium based alloy, possibly making a reduction in tensile properties more easily visible than for instance with the less ductile AZ91. Molten metal cleanliness was adjusted in part by introducing thin-walled scrap to a reference ingot melt, and in part by turning off the gas protection for short periods allowing the melt to burn. It was not possible to predict the metal cleanliness, it could only be determined retrospectively. Molten metal cleanliness was monitored with the Hydro Magnesium Inclusion Assessment Method (HMIAM) (16,17), distinguishing between oxide particles and oxide films. Samples were withdrawn both before and after casting of the melts. The melts were stirred manually just before casting in order to interrupt the refining caused by settling. The chemical composition of the melts was controlled by spectrographic analysis of permanent mould cast specimens. Die casting of test bars was done on the 3-cavity test bar die on the 200 ton Frech machine in Hydro Magnesium's foundry laboratory. Standard die cast test bars were made from 17 Magnesium Alloys and their Applications. Edited by K. U. Kainer.

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Section: Introductionmentioning

confidence: 99%