Formation of Fine Spheroidal Microstructure of Semi-Solid Al—Zn—Mg—Cu Alloy by Hyperthermally and Subsequent Isothermally Reheating
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第10期
论文作者：Gang Chen Jufu Jiang Zhiming Du Qi Cao Hongwei Li Xin Zhang
文章页码：979 - 982
摘 要：The high strength 7xxx series aluminium alloys are usually difficult to be prepared as semi-solid feedstock,because some dispersoid particles（soluble only in liquid） could pin at grain and subgrain boundary to make the alloy difficultly recrystallise.In this work,a novel multistep reheating regime is developed for recrystallisation and partial melting（RAP） route to prepare fine spheroidal microstructure of semi-solid AleZne MgeCu alloy.After reheating to 665℃,holding for 4 min and subsequent isothermally holding at 620℃ with total heating time of 15 min,fine spheroidal microstructures with grain size of w40 mm were prepared without remained unrecrystallised grains and directionality,which are much finer than the conventionally obtained microstructures（w100 mm）.
Gang Chen1，Jufu Jiang1，Zhiming Du1，Qi Cao1，Hongwei Li2,3，Xin Zhang2,3
1. School of Materials Science and Engineering,Harbin Institute of Technology2. Technology Institute,Beijing North Vehicle Group Corporation
摘 要：The high strength 7xxx series aluminium alloys are usually difficult to be prepared as semi-solid feedstock,because some dispersoid particles（soluble only in liquid） could pin at grain and subgrain boundary to make the alloy difficultly recrystallise.In this work,a novel multistep reheating regime is developed for recrystallisation and partial melting（RAP） route to prepare fine spheroidal microstructure of semi-solid AleZne MgeCu alloy.After reheating to 665℃,holding for 4 min and subsequent isothermally holding at 620℃ with total heating time of 15 min,fine spheroidal microstructures with grain size of w40 mm were prepared without remained unrecrystallised grains and directionality,which are much finer than the conventionally obtained microstructures（w100 mm）.
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