Microstructural evolution of Al-7.3Zn-2.2Mg-2Cu (Al7068) alloy in T6 condition during isothermal compression using 3-dimensional processing map

被引：31
作者：
Raja, Nitish [1 ]
Daniel, B. S. S. [1 ]
机构：
[1] Indian Inst Technol Roorkee, Cellular & Composite Mat Lab, Met & Mat Engn, Roorkee 247667, Uttarakhand, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 902卷
关键词：
Aluminium alloy; Al7068; alloy; Thermo-mechanical simulation; Hot compression; Processing map; HOT DEFORMATION-BEHAVIOR; 7075; ALUMINUM-ALLOY; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; STRAIN-RATE; PRECIPITATION; WORKABILITY; STRENGTH;
D O I：
10.1016/j.jallcom.2022.163690
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Elevated temperature isothermal compression of Al-7.3Zn-2.2Mg-2Cu (Al7068) alloy in T6 condition was studied till a true strain of 0.69 in the working temperature and deformation rate range of 250-450 degrees C and 0.001-1 s(-1), respectively. The rheological behaviour of the specimens showed a decrease in the flow stress values at the higher temperature and lower strain rates. The mean deformation activation energy at peak stress was estimated as 266 kJ/mol. 3D processing map suggested two safe working zones (I and II) for the current alloy. Zone I, with a peak efficiency of 57% located in the domain of 288-312 degrees C at 0.001 s(-1), and zone II with an efficiency >= 48% located in the range of 400-450 degrees C and 0.001-0.044 s(-1). The EBSD IPF micrograph of the compression specimens showed a dominance of deformed grains with few fine DRX grains near the grain boundary regions. The analysis showed that the microstructural evolution during hot compression progressed through the CDRX mechanism. TEM analysis confirmed precipitate coarsening with increase in processing temperature and decrease in the deformation rate. (C) 2022 Elsevier B.V. All rights reserved.
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页数：13
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