%0 Generic %A Acer, Emine %A Çadırlı, Emin %A Erol, Harun %A Kaya, Hasan %A Şahin, Mevlüt %A Gündüz, Mehmet %D 2018 %T Effect of Growth Velocity and Zn Content on Microhardness in Directionally Solidified Al-Zn Alloys %U https://scielo.figshare.com/articles/dataset/Effect_of_Growth_Velocity_and_Zn_Content_on_Microhardness_in_Directionally_Solidified_Al-Zn_Alloys/7102781 %R 10.6084/m9.figshare.7102781.v1 %2 https://scielo.figshare.com/ndownloader/files/13073264 %2 https://scielo.figshare.com/ndownloader/files/13073273 %2 https://scielo.figshare.com/ndownloader/files/13073279 %2 https://scielo.figshare.com/ndownloader/files/13073285 %2 https://scielo.figshare.com/ndownloader/files/13073294 %2 https://scielo.figshare.com/ndownloader/files/13073297 %2 https://scielo.figshare.com/ndownloader/files/13073306 %2 https://scielo.figshare.com/ndownloader/files/13073315 %2 https://scielo.figshare.com/ndownloader/files/13073318 %2 https://scielo.figshare.com/ndownloader/files/13073321 %K Al-Zn alloys %K microstructure %K microhardness %K growth velocity %K directional solidification %X

In this study, Al-xZn (x=1, 3, 5, 7, 10 and 20 wt. %) alloys were prepared using metals of 99.99% high purity in the vacuum atmosphere. These alloys were directionally solidified upward with a constant temperature gradient, G (10.3 K/mm) and different growth velocities (V) between 8.25 and 165 µm/s in the directional solidification apparatus. The experimental results have revealed that with the increase of the growth velocity of the melts from 8.25 µm/s to 165 µm/s, the microstructures undergo a transition from cellular/cellular dendritic morphology to coarse dendritic form for each composition (Zn content, Co). The measurements of microhardness (HV) of the specimens were performed by using a microhardness test device. The dependence of HV on V and Co was analyzed, and it has been found that with increasing the V and Co the HV increases. Relationships between HV-V and HV-Co were obtained by linear regression analysis, and the experimental results were compared with the results of previous similar works.

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