MICROSTRUCTURE AND MICROHARDNESS ANALYSIS OF EXTRUDED ALUMINIUM ALLOY AA6063
Keywords:
Extrusion, Optical Microscopy, Microstructure, MicrohardnessAbstract
The experimental procedure and image analysis for the microstructure and microhardness analysis of aluminum AA 6063 is given. The analysis includes the change of grain size and microhardness in thermo-mechanical history of extrusion. The grain sizes and microhardness are calculated at three different stages of extrusion which are as-cast billet, as-extruded and as-hardened. The whole plan is carried out in three steps. In first step extrusion trials are carried out on AA 6063, in second step grain sizes are calculated and in third step the microhardness are calculated. Optical microscopy and image analysis with Dexel Imaging is conducted to calculate the grain size of AA 6063. For the microhardness calculation Vickers Hardness Tester with Quntimate Imagetech software are used. To study the change in grain size and microhardness, the percentage reduction in grain size and percentage increase in microhardness was presented here. The results of the analysis are given and discuss.
Downloads
References
Schikorraa M Donati L Tomesani L Tekkaya A E (2008), “Microstructure Analysis of Aluminium Extrusion: Prediction of Microstructure on AA6060 Alloy”, Journal of materials processing technology, Vol.201, 156–162.
Warmuzek M (2004), “Metallographic Techniques for Alluminum and Its Alloys”, Metallography and Microstructures, ASM Handbook, ASM International, Vol. 9, 711-751.
http://www.azom.com/article.aspx?ArticleID=2812 cited on 16 July 2014 15:23 IST.
Roy Woodward, “Aluminium Extrusion: Alloys, Shapes and Properties”, TALAT Lecture 1302, Aluminium Federation, Birmingham.
YuanyuanGeng (2011), “Microstructure Evolution during Extrusion of AA3xxx Aluminium Alloys”.
Schikorra M Donati L Tomesani L Tekkaya A E (2007), “Microstructure Analysis of Aluminium Extrusion: Grain Size Distribution in AA6060, AA6082 and AA7075 Alloys”, Journal of Mechanical Science and Technology, Vol. 21, 1445-1451.
George Vander Voort, “Metallography and Microstructure of Aluminium and Alloys”.
Lrivas A Munoz P Camero S Quintero-Sayago O (1999), “Effect of the Microstructure on the Mechanical Properties and Surface Finish of an Extruded AA-6063 Aluminium Alloy”, ADV. MAT. SCI. & TECH. Vol. 2, 15-23.
http://www.gordonengland.co.uk/hardness/microhardness.htm cited on 10 November 2014 11:15 IST.
http://shodhganga.inflibnet.ac.in:8080/jspui/bitstream/10603/516/10/10_chapter%204.pdf cited on 10 November 2014 11:15 IST.
Abdel-Rahman M A AlaaAldeenAhmeda Emad Badawi A (2010), “ Testing Natural Aging Effect on Properties of 6066 & 6063 Alloys using Vickers Hardness and Positron Annihilation Lifetime Techniques”, Defect and Diffusion Forum, Vols. 303-304, 107-112.
De Silva G I P and Perera W C (2012), “Improvement of The Mechanical Properties of Aluminium 6063 T5 Extrudates By Varying The Aging Condition Cost-Effectively”, SAITM Research Symposium on Engineering Advancements.
