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Forging of Mg‐Alloys AZ31 and AZ80
Author(s) -
Viehweger B.,
Karabet A.,
Düring, M.,
Schaeffer L.
Publication year - 2005
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200400856
Subject(s) - forging , raw material , materials science , rod , metallurgy , microstructure , material flow , compression (physics) , mechanical engineering , composite material , engineering , medicine , ecology , chemistry , alternative medicine , organic chemistry , pathology , biology
Mg‐wrought alloys recently became an engineer material of constantly increasing interest. The mechanical properties of extruded Mg‐feedstock of the alloys AZ80 and AZ31 indicate their suitability for automotive applications in form of high‐quality forgings. Therefore a detailed knowledge about the forming behaviour is of particular importance. In order to compare mechanical properties of available Mg‐feedstock qualities compression tests at room temperature have been carried out by applying batches of AZ31‐ and AZ80‐feedstock. Cylindrical specimens were made out of received continuously casted as well as extruded AZ31‐ and AZ80 ‐ rods. A quantitative analysis of Mg‐feedstock’s microstructure has been carried out. The characterization of the deformability of applied Mg‐feedstock under hot working conditions could be performed by means of uniaxial plain strain upsetting tests at temperatures between 300 and 450 °C as well as logarithmic strain rates of 10 ‐1 , 1 and 10s ‐1 . It is shown that the chosen parameter range ensures an enhanced deformability of continuously as well as extruded Mg‐feedstock. The subsequently carried out determination of microstructural evolution could be related to obtained flow stress curves of applied batches of Mg‐feedstock. Furthermore, FVM/FEM‐systems have been employed in order to design a simplified geometry of heated forging dies suitable for forging tests. The tests have been carried out by means of a hydraulic press. During the tests their punch velocity has been varied between 1 and 40 mm/s. Hence numerically simulated results could be confirmed by practical tests. Exemplary forgings of a simplified shape were made out of all applied batches of Mg‐feedstock. No remarkable failures have been detected.