Çinko Oranının Al-(5-50)Zn Alaşımlarının Yapısal ve Mekanik Özelliklerine Etkisi

Year 2019, Volume: 9 Issue: 1, 16 - 25, 15.01.2019

Ali Paşa Hekimoğlu , Yunus Emre Turan

https://doi.org/10.17714/gumusfenbil.381050

Cited By: 4

Abstract

Bu çalışmada ağırlıkça
%5 ile 50 arasında farklı oranlarda çinko içeren on adet ikili alüminyum-çinko
alaşımı kokil kalıba döküm yöntemiyle üretildi. Üretilen alaşımların içyapıları
ışık mikroskobunda incelendi. Alaşımlarının içyapısında bulunan fazları
belirlemek için X-ışını kırınım (XRD) çalışmaları yapıldı. Elde edilen bulgular
% 15 çinko oranına kadar alaşımların içyapısının alüminyumca zengin α fazından
oluştuğunu ve alaşımdaki çinkonun bu faz içinde tamamen çözündüğünü
göstermektedir. Çinko oranı % 15’i aştığında α fazının yanı sıra yapıda çinkoca
zengin η fazının oluşmaya başladığı, %25’i aşması durumunda ise α fazının
dendritik bir şekilde büyüdüğü görüldü. Alaşımların sertlik değerlerinin artan
çinko oranı ile sürekli arttığı, çekme ve basma dayanımı değerlerinin ise %30
çinko oranına kadar arttığı bu orandan sonra azaldığı görüldü. Artan çinko
oranı ile alaşımların içyapısında meydana gelen değişimler katılaşma davranışlarına,
mekanik özelliklerinde meydana gelen değişimler ise yapısal değişimlere
dayandırılarak irdelendi.

Keywords

Al-Zn Alaşımları, İçyapı, Mekanik Özellikler, Özgül Mukavemet

Effect of Zinc Content on the Microstructure and Mechanical Properties of the Al-(5-50)Zn Alloys

Abstract

In this study, ten binary aluminum-zinc alloys containing zinc in different ratios between 5 and 50% by weight were produced by permanent mold casting method. The microstructures of the produced alloys were examined in light microscope. X-ray diffraction (XRD) studies were carried out to determine the phases in the microstructure of the alloys. The findings show that the microstructure of the alloys up to 15% zinc is composed of aluminum-rich α phase and the zinc in the alloy completely dissolves in this phase. It was also showed that when the zinc content exceeds 15%, besides the α-phase, the zinc-rich η phase begins to form, and when the zinc content exceeds 25%, the α-phase grows dendritically. The hardness, tensile, and compression strength values ​​of the alloys increased continuously with increasing zinc content but after the % 30 zinc content tensile and compression strength values decreased. The changes in the microstructure and mechanical properties of the alloys were discussed based on their solidification behaviors and structural changes.

Keywords

Al-Zn Alloys, Microstructure, Mechanical Properties, Specific Strength

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