Enhancing the Hardness of Mg-9Al-1Zn Cast Alloy by Solution Treatment

Adi Ganda Putra, Azwar Manaf, Anawati Anawati

Research output: Contribution to journalConference articlepeer-review

Abstract

Magnesium alloys are lightweight materials that have a great potential to be developed because the alloy can reduce the energy consumption and total weight. The alloy is made of magnesium metal as a primary component characterized by a soft and mechanically low-strength. The addition of aluminium in Mg-Al system will form Mg 17 Al 12 particles causing grain refining the effect of the α-Mg matrix. Similarly, the addition of Zn in Mg-Zn system increases the strength and hardness of the alloy. Hence, the combined addition of Al and Zn in Mg-Al-Zn system would be interesting for automotive component applications. In this study, we have carried out the casting process for Mg-9Al-1Zn (wt. %) through a gravity of the metal mold with air cooling method. The cast alloy designated as Mg9Al1Zn alloy received a solution treatment at temperature of 415 °C for 2 hours. The microstructure observation for the cast alloy showed the presence of α-Mg as a matrix with the largest fraction and β-Mg 17 Al 12 phase as a precipitate. The microstructure also showed the presence of pores indicated by black colour. We have also undertaken microanalysis to each phase present in the sample by EDS that detected all elements. The result of Hardness evaluation confirmed that the solution treated as-cast alloys possessed the hardness value of 65.21. The VHN significantly enhanced when compared with that of original cast-alloy which was only 73.02 VHN. The enhancement of the hardness is discussed in relation with processing method and microstructure development after a solution treatment.

Original languageEnglish
Article number012088
JournalIOP Conference Series: Materials Science and Engineering
Volume515
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019
EventInternational Conference on Condensed Matters and Advanced Materials 2018, IC2MAM 2018 - Malang, Indonesia
Duration: 5 Sep 2018 → …

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