How does surface integrity of nanostructured surfaces induced by severe plastic deformation influence fatigue behaviors of Al alloys with enhanced precipitation?

被引：25
作者：
Maurel, Pierre [1 ,2 ,3 ]
Weiss, Laurent [1 ]
Grosdidier, Thierry [1 ,3 ]
Bocher, Philippe [2 ]
机构：
[1] Univ Lorraine, UMR CNRS 7239, Lab LEM 3, 7 Rue Felix Savart, F-57073 Metz, France
[2] Ecole Technol Super, Lab Optimisat Precedes Fabricat Avances LOPFA, 1100 Rue Notre Dame Ouest, Montreal, PQ H3C 1K3, Canada
[3] LAB EXcellence Design Alloy Met Low mAss Struct L, 7 Rue Felix Savart, F-57073 Metz, France
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 140卷
关键词：
Severe Plastic Deformation (SPD); Aluminium; High cycle fatigue; Surface Mechanical Attrition Treatment (SMAT); Precipitation aging; Duplex treatment; MECHANICAL ATTRITION TREATMENT; THERMAL-STABILITY; PROCESSING PARAMETERS; CORROSION-RESISTANCE; CRACK-PROPAGATION; GRAIN-REFINEMENT; STRENGTH; DUCTILITY; MICROSTRUCTURE; PRINCIPLES;
D O I：
10.1016/j.ijfatigue.2020.105792
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Effects on fatigue behaviors and microstructures of Surface Mechanical Attrition Treatment (SMAT) before or after precipitation aging have been investigated on two hardenable Al alloys. The aluminum alloy with high notch sensitivity (7075) should not be processed by SMAT as the generated low surface integrity is always detrimental to fatigue performances. On less notch sensitive alloys (2024), SMAT before aging formed smaller and denser precipitates, resulting in a high hardened depth, and microstructures more resistant to residual stress relaxation than after conventional shot-peening. SMAT after aging resulted in a significant improvement of fatigue performance with only subsurface crack nucleation sites.
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页数：12
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