Titanyum ile tane inceltmenin Al-25Zn alaşımının mikroyapı, mekanik ve korozyon özelliklerine etkisinin incelenmesi

Yıl 2020, Cilt: 35 Sayı: 1, 311 - 322, 25.10.2019

Ali Paşa Hekimoğlu , Merve Çalış

https://doi.org/10.17341/gazimmfd.464676

Cited By: 7

Öz

Bu
çalışmada, bir adet ikili Al-25Zn alaşımı ve Al-25Zn-0,01Ti, Al-25Zn-0,03Ti,
Al-25Zn-0,04Ti, Al-25Zn-0,05Ti, Al-25Zn-0,075Ti, Al-25Zn-0,1Ti, Al-25Zn-0,2Ti,
Al-25Zn-0,4Ti, Al-25Zn-0,6Ti, Al-25Zn-0,8 ve Al-25Zn-1Ti olmak üzere 11 adet
üçlü alüminyum-çinko-titanyum alaşımı kokil kalıba döküm yöntemiyle üretildi.
Üretilen alaşımların içyapı, mekanik ve korozyon özellikleri incelendi. İçyapı
incelemeleri elektron mikroskobu(SEM) ve X-ışını kırınım(XRD) çalışmalarıyla
gerçekleştirildi. Mekanik özellikler ise Brinell sertlik ölçüm yöntemi ve çekme
deneyi yardımıyla belirlendi. Korozyon deneyleri elektrokimyasal test
düzeneğinde ASTM G5 standardına uygun olarak gerçekleştirildi. Al-25Zn ve
Al-25Zn-Ti alaşımlarının içyapılarının ana matris olarak α ve η fazlarından
oluştuğu, titanyum oranının %0,01’i aşması durumunda içyapıda Al₃Ti fazının
çökelmeye başladığı gözlendi. Ayrıca Al-25Zn-Ti alaşımlarındaki dendrit veya
tanelerin boyutunun ikili alaşıma göre çok daha küçük olduğu görüldü. Al-25Zn
alaşımına %0,01 oranında yapılan titanyum katkısının sertlik, akma ve çekme
mukavemeti değerlerini artırdığı bu orandan daha yüksek katkıların ise azalttığı
gözlendi. Titanyum katkılarının korozyon özelliklerini olumsuz etkilediği
görüldü. Farklı oranlardaki titanyum katkıları nedeniyle Al-25Zn alaşımının
mekanik ve korozyon özelliklerinde meydana gelen değişimler alaşımların yapısal
özelliklerine dayandırılarak açıklandı.

 

Anahtar Kelimeler

Al-25Zn-Ti alaşımları, Titanyum katkısı, Tane inceltme, Mekanik özellikler, Korozyon

Effect of grain refinement with titanium on the microstructure, mechanical and corrosion properties of Al-25Zn alloy

Öz

In this study, one binary Al-25n alloys and eleven
ternary aluminum-zinc-titanium alloys, Al-25Zn-0.01Ti, Al-25Zn-0.03Ti,
Al-25Zn-0.04Ti, Al-25Zn-0.05Ti, Al-25Zn-0.075Ti, Al-25Zn-0.1Ti, Al-25Zn-0.2Ti,
Al-25Zn-0.4Ti, Al-25Zn-0.6Ti, Al-25Zn-0.8 and Al-25Zn-1Ti, were produced by
permanent mold casting method. Structural, mechanical, and corrosion properties
of the tested alloys were investigated. Structural investigations were carried
out with scanning electron microscope (SEM) and X-ray diffraction (XRD)
studies. Mechanical properties of the alloys were determined with the Brinell
hardness and tensile tests. Corrosion tests were carried out with
electrochemical test setup in accordance with ASTM G5 standard. Al-25Zn and
Al-25Zn-Ti alloys were composed of α and η phases as the main matrix, and it
was observed that Al₃Ti phase began to precipitate in the microstructure
when the titanium content exceeded 0.01%. In addition, the size of dendrites or
grains of the Al-25Zn-Ti alloys was found to be much smaller than that of
binary alloy. The hardness, yield strength, and tensile strength
values of the Al-25Zn alloy significantly increased with the 0.01%Ti addition,
but when Ti content exceeded 0.01%, these values decreased with increasing
titanium content. It was observed that titanium addition had a negative effect
on the corrosion properties of the Al-25Zn alloy. The change on the mechanical
and corrosion properties of the Al-25Zn alloy due to the titanium addition in
different ratios have been explained based on the structural properties of the
alloys.

 

Anahtar Kelimeler

Al-25Zn-Ti alloys, Titanium additive, Grain refinement, Mechanical properties, Corrosion

Kaynakça

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