Preparation of high-strength Al-Mg-Si-Cu-Fe alloy via heat treatment and rolling
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第7期
论文作者：Chong-yu Liu Peng-fei Yu Xiao-ying Wang Ming-zhen Ma Ri-ping Liu
文章页码：702 - 710
摘 要：An Al-Mg-Si-Cu-Fe alloy was solid-solution treated at 560℃ for 3 h and then cooled by water quenching or furnace cooling.The alloy samples which underwent cooling by these two methods were rolled at different temperatures.The microstructure and mechanical properties of the rolled alloys were investigated by optical microscopy,scanning electron microscopy,transmission electron microscopy,X-ray diffraction analysis,and tensile testing.For the water-quenched alloys,the peak tensile strength and elongation occurred at a rolling temperature of 180℃.For the furnace-cooled alloys,the tensile strength decreased initially,until the rolling temperature of 420℃,and then increased;the elongation increased consistently with increasing rolling temperature.The effects of grain boundary hardening and dislocation hardening on the mechanical properties of these rolled alloys decreased with increases in rolling temperature.The mechanical properties of the 180℃ rolling water-quenched alloy were also improved by the presence of β" phase.Above 420℃,the effect of solid-solution hardening on the mechanical properties of the rolled alloys increased with increases in rolling temperature.
Chong-yu Liu1,2,3，Peng-fei Yu1，Xiao-ying Wang1，Ming-zhen Ma1，Ri-ping Liu1
1. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University2. Key Laboratory of New Processing Technology for Nonferrous Metal & Materials,Ministry of Education,Guilin University of Technology3. College of Materials Science and Engineering,Guilin University of Technology
摘 要：An Al-Mg-Si-Cu-Fe alloy was solid-solution treated at 560℃ for 3 h and then cooled by water quenching or furnace cooling.The alloy samples which underwent cooling by these two methods were rolled at different temperatures.The microstructure and mechanical properties of the rolled alloys were investigated by optical microscopy,scanning electron microscopy,transmission electron microscopy,X-ray diffraction analysis,and tensile testing.For the water-quenched alloys,the peak tensile strength and elongation occurred at a rolling temperature of 180℃.For the furnace-cooled alloys,the tensile strength decreased initially,until the rolling temperature of 420℃,and then increased;the elongation increased consistently with increasing rolling temperature.The effects of grain boundary hardening and dislocation hardening on the mechanical properties of these rolled alloys decreased with increases in rolling temperature.The mechanical properties of the 180℃ rolling water-quenched alloy were also improved by the presence of β" phase.Above 420℃,the effect of solid-solution hardening on the mechanical properties of the rolled alloys increased with increases in rolling temperature.
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