Microstructural characteristics and mechanical properties of Al-2024 alloy processed via a rheocasting route
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第1期
论文作者：Behnam Rahimi Hamed Khosravi Mohsen Haddad-Sabzevar
文章页码：59 - 67
摘 要：This article reports the effects of stirring speed and T6 heat treatment on the microstructure and mechanical properties of Al-2024 alloy synthesized by a rheocasting process.There was a decrease in grain size of α-Al particles corresponding to an increase in stirring speed.By increasing the stirring speed,however,the globularity of matrix particles first increased and then declined.It was also found that the hardness,compressive strength,and compressive strain increased with the increase of stirring speed.Microstructural studies revealed the presence of nonsoluble Al15（CuFeMn）3Si2 phase in the vicinity of CuAl2 in the rheocast samples.The required time for the solution treatment stage was also influenced by stirring speed;the solution treatment time decreased with the increase in stirring speed.Furthermore,the rheocast samples required a longer homogenization period compared to conventionally wrought alloys.Improvements in hardness and compressive properties were observed after T6 heat treatment.
Behnam Rahimi1，Hamed Khosravi2，Mohsen Haddad-Sabzevar1
1. Department of Metallurgy and Materials Engineering,Faculty of Engineering,Ferdowsi University of Mashhad2. Faculty of Materials Science and Engineering,K.N.Toosi University of Technology
摘 要：This article reports the effects of stirring speed and T6 heat treatment on the microstructure and mechanical properties of Al-2024 alloy synthesized by a rheocasting process.There was a decrease in grain size of α-Al particles corresponding to an increase in stirring speed.By increasing the stirring speed,however,the globularity of matrix particles first increased and then declined.It was also found that the hardness,compressive strength,and compressive strain increased with the increase of stirring speed.Microstructural studies revealed the presence of nonsoluble Al15（CuFeMn）3Si2 phase in the vicinity of CuAl2 in the rheocast samples.The required time for the solution treatment stage was also influenced by stirring speed;the solution treatment time decreased with the increase in stirring speed.Furthermore,the rheocast samples required a longer homogenization period compared to conventionally wrought alloys.Improvements in hardness and compressive properties were observed after T6 heat treatment.
关键词：
