Microstructural Evolution and Mechanical Properties of Mg Added ZA-12 Alloy

Yıl 2020, Cilt: 11, 57 - 63, 31.12.2020

Ibrahim Celıkyurek Bedri Baksan Osman Torun

Öz

A ZA-12 Zinc-based alloy was melted in an induction melting furnace, and cast in a graphite mold. Different amount of Mg was added for examining the microstructural evolution and mechanical properties of ZA-12 alloy. All alloys were annealed at 350oC for 22 hours to research the effect of heat treatment on the properties of ZA-12 alloy. The microstructure examinations revealed that while ZA-12 alloy has a dendritic microstructure with fine grains, with the Mg addition the distance between dendrite arms was getting larger. The hardness of alloys was increased with an increase in Mg content. The hardness of all alloys was increased slightly with the annealing also. Compression tests were performed to determine the mechanical properties. These tests showed that the yield strength and elongation are increased with increasing Mg amount for as casted alloys. The annealing heat treatment decreased the yield strength of alloys. A brittleness was observed for as-cast alloys containing more than 2.0wt.% Mg. The brittleness was still existing after heat treatment for alloy including 4.0 wt.% Mg while the alloy containing 2.0 wt.% of Mg became ductile.

Anahtar Kelimeler

Zinc-based alloys, microstructure, hardness, compression strength

Kaynakça

• Abou El-Khair M.T., Daoud A., Ismail A. (2004). Effect of different Al contents on the microstructure, tensile, and wear properties of Zn-based alloy. Materials Letters, 58, 1754-1760.
• Alaneme K.K., Ajayi O.J. (2017). Microstructure and mechanical behavior of stir-cast Zn-27Al based composites reinforced with rice husk ash, silicon carbide, and graphite. Journal of King Saud University-Engineering Sciences, 29, 172-177.
• Almomani M., Hayajneh M.T., Draidi M. (2016). Tribological investigation of Zamak alloys reinforced with alumina (Al2O3) and fly ash. Particulate Science and Technology, 34, 317-323.
• Hanna M.D., Carter J.T., Rashid M.S. (1997). Sliding wear and friction characteristics of six Zn-based die-casting alloys. Wear, 203-204, 11-21.
• Li Z.Q., Zhang S.Y., Wu B.Y. (2001). Solidification and microstructure of ZA27/SiCp composite fabricated by mechanical – electromagnetic combination stirring process. Materials Science and technology, 17, 465-472.
• Liu J., Yu S., Zhu X, Wei M., Luo Y., Liu Y. (2009). Correlation between ceramic additions and compressive properties of Zn-22Al matrix composite foams. Journal of Alloys and Compounds, 476, 220-225.
• Madronero A., Cruz J., Foruria C., Coleto J. (1997). Rheocasting a Zn-Al Composite reinforced with Coke dust. Journal of Minerals, Metals and Materials Society, 49, 46-49.
• Narimannezhad A., Aashuri H., Kokabi A.H., Khosravani A. (2009). Microstructural evolution and mechanical properties of semisolid stir welded zinc AG40A die cast alloy. Journal of Materials Processing Technology, 209, 4112-4121.
• Pola A., Montesano L., Gelfi M., La Vecchia G.M. (2016). Comparison of the sliding wear of a novel Zn alloy with that of two commercial Zn alloys against bearing steel and leaded brass. Wear, 368-369, 445-452.
• Prasad B.K., Patwardhan A.K., Yegneswaran A.H. (1996). Dry sliding wear characteristic of some zinc-aluminium alloys: a comparative study with a conventional bearing bronze at a low speed. Wear, 199, 142-151.
• Pürçek G., Savaşkan T., Küçükömeroğlu T., Murphy S. (2002). Dry sliding friction and wear properties of zinc-based alloys. Wear, 252, 894-901.
• Savaşkan T, Hekimoğlu A.P., Pürçek G. (2004). Effect of copper content on the mechanical and sliding wear properties of monotectoid-based zinc-aluminium-copper alloys. Tribology International, 37, 45-50.
• Savaşkan T., Hekimoğlu A.P. (2014). Microstructure and mechanical properties of Zn-15Al-based ternary and quaternary alloys. Materials Science and Engineering A, 603, 52-57.
• Şevik H. (2014). The effect of silver on wear behavior of zinc-aluminium-based ZA-12 alloy produced by gravity casting. Materials Characrterization, 89, 81-87.
• Tao L., Dellis M.A., Boland F., Delannay F. (1995). Comparison of fibres for creep strengthening of zinc-aluminium foundry alloys. Composites, 26, 611-617.
• Türk A., Kurnaz C., Çevik H. (2007). Comparison of the wear properties of modified ZA-8 alloys and conventional bearing bronze. Materials and Design, 28, 1889-1897.
• Xu Z., Ma L., Yan J, Chen W., Yang S. (2014). Solidification microstructure of SiC particulate reinforced Zn-Al composites under ultrasonic exposure. Materials Chemistry and Physics, 148, 824-832.