Effects of Aging under Stress on Mechanical Properties and Microstructure of EN AW 7075 Alloy

被引：11

作者：

Sajadifar, Seyed Vahid ^{[1
]}

Krooss, Philipp ^{[1
]}

Frock, Hannes ^{[2
]}

Milkereit, Benjamin ^{[2
,3
]}

Kessler, Olaf ^{[2
,3
]}

Niendorf, Thomas ^{[1
]}

机构：

[1] Univ Kassel, Inst Mat Engn, Monchebergstr 3, D-34125 Kassel, Germany

[2] Univ Rostock, Fac Mech Engn & Marine Technol, Albert Einstein Str 2, D-18059 Rostock, Germany

[3] Univ Rostock, Competence Ctr CALOR, Dept Life Light & Matter, Albert Einstein Str 25, D-18059 Rostock, Germany

来源：

METALS | 2021年 / 11卷 / 07期

关键词：

high strength aluminum alloy; stress-aging; DSC; heat treatment; thermo-mechanical treatment; STRENGTH ALUMINUM SHEET; CU-MG-AG; HEAT-TREATMENT; BEHAVIOR; PRECIPITATION; DEFORMATION; RECRYSTALLIZATION; EVOLUTION; TENSILE; PLATE;

D O I：

10.3390/met11071142

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, microstructural and mechanical properties of EN AW 7075 following stress-aging were assessed. For this purpose, properties of stress-aged samples were compared with values obtained for conventionally aged counterparts. It is revealed that the strength and hardness of EN AW 7075 can be increased by the presence of external stresses during aging. Precipitation kinetics were found to be accelerated. The effects of conventional and stress-aging on the microstructure were analyzed using synergetic techniques: the differently aged samples were probed by differential scanning calorimetry (DSC) in order to characterize the precipitation processes. DSC was found to be an excellent screening tool for the analysis of precipitation processes during aging of this alloy with and without the presence of external stresses. Furthermore, using electron microscopy it was revealed that an improvement in mechanical properties can be correlated to changes in the morphologies and sizes of precipitates formed.

引用

页数：15

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