Effect of Growth Velocity and Zn Content on Microhardness in Directionally Solidified Al-Zn Alloys
Küçük Resim Yok
Tarih
2018
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Univ Fed Sao Carlos, Dept Engenharia Materials
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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 mu m/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 mu m/s to 165 mu m/s, the microstructures undergo a transition from cellular/cellular dendritic morphology to coarse dendritic form for each composition (Zn content, C-o). The measurements of microhardness (HV) of the specimens were performed by using a microhardness test device. The dependence of HV on V and C(o )was analyzed, and it has been found that with increasing the V and C-o the HV increases. Relationships between HV-V and HV-C-o were obtained by linear regression analysis, and the experimental results were compared with the results of previous similar works.
Açıklama
Anahtar Kelimeler
Al-Zn alloys, microstructure, microhardness, growth velocity, directional solidification
Kaynak
Materials Research-Ibero-American Journal of Materials
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
21
Sayı
6
