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Development of Second-Phase Particles during Solidification and Homogenization of Aluminium Alloy AlMn1

Bildung von Phasen während der Erstarrung und Homogenisierung der Aluminium-Legierung AlMn1
  • O. Engler , K. Kuhnke and K. Westphal
From the journal Practical Metallography

Abstract

An important aspect in describing the microstructure of non-heat treatable Al wrought alloys is their constitution in the form of dissolved alloy elements or precipitated second-phase particles. These characteristic structural constituents, which practically can be subsumed as microchemistry, have an impact on the physical and, in particular, on the mechanical properties of Al materials. The present work examines the formation of constituent phases during solidification as well as the microchemical changes during a subsequent homogenization annealing of the alloy AA 3103 (AlMn1). The forming phases were statistically analyzed in a scanning electron microscope regarding their size, shape, area density and chemical composition. The results were matched with complementary characterization methods to explain the microchemical changes during solidification and the subsequent homogenization.

Kurzfassung

Ein wichtiger Aspekt bei der Beschreibung der Mikrostruktur nicht-aushärtbarer Al-Knetlegierungen ist deren Konstitution in Form von gelösten Legierungselementen bzw. ausgeschiedenen Fremdphasen. Diese charakteristischen Gefügebestandteile, die praktischerweise als Mikrochemie zusammengefasst werden können, haben einen Einfluss auf die physikalischen und insbesondere die mechanischen Eigenschaften von Al-Werkstoffen. In der vorliegenden Arbeit wurde die Bildung von Gussphasen während der Erstarrung sowie die mikrochemischen Änderungen während einer nachfolgenden Homogenisierungsglühung der Legierung AA 3103 (AlMn1) untersucht. Die sich bildenden Phasen wurden in einem Rasterelektronenmikroskop statistisch hinsichtlich ihrer Größe, Form, Flächendichte und chemischen Zusammensetzung analysiert. Die Ergebnisse wurden mit komplementären Charakterisierungsmethoden abgeglichen, um die mikrochemischen Änderungen während der Erstarrung und der nachfolgenden Homogenisierung zu erklären.


Übersetzung: M. Lackas


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Received: 2018-09-10
Accepted: 2018-10-15
Published Online: 2019-05-03
Published in Print: 2019-05-15

© 2019, Carl Hanser Verlag, München

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