Microstructure and fatigue properties of extruded aluminum alloys 7046 and 7108 for automotive applications

In this study, the fatigue characteristics of aluminum alloys and mechanical components were investigated. To evaluate the effect of forging, fatigue specimens with the same chemical compositions were prepared from billets and forged mechanical components. To evaluate the cleanliness of the aluminum alloys, the cross-sectional area of specimens was observed, and the maximum inclusion sizes were obtained using extreme value statistics. Rotary bending fatigue tests were performed, and the fracture surfaces of the specimens were analyzed. The results show that the forging process not only elevated the fatigue strength but also reduced the scatter of the fatigue life of aluminum alloys. The fatigue characteristics of C-specimens were obtained to develop finite-element method (FEM) models. With the intrinsic fatigue properties and strain–life approach, the FEM analysis results agreed well with the test results.

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Effects of HIPping on high-cycle fatigue properties of investment cast A356 aluminum alloys

Materials Science and Engineering A ◽

10.1016/s0921-5093(02)00157-0 ◽

2003 ◽

Vol 340 (1-2) ◽

pp. 123-129 ◽

Cited By ~ 36

Author(s):

Min Ha Lee ◽

Jae Joong Kim ◽

Kyung Hoon Kim ◽

Nack J. Kim ◽

Sunghak Lee ◽

...

Keyword(s):

Aluminum Alloys ◽

High Cycle Fatigue ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Investment Cast ◽

A356 Aluminum

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Tensile and Fatigue Properties of Two High-strength Aluminum Alloys Prepared by Rapid Solidification Technology

Rapidly Quenched Metals 6 ◽

10.1016/b978-1-85166-972-1.50099-3 ◽

1988 ◽

pp. 475-478

Author(s):

S.C. JHA ◽

R. RAY

Keyword(s):

Aluminum Alloys ◽

Rapid Solidification ◽

High Strength ◽

Fatigue Properties ◽

High Strength Aluminum Alloys ◽

Solidification Technology ◽

Rapid Solidification Technology

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Microstructure-Based Assessment of the Corrosion Fatigue Behavior of the Creep-Resistant DieMag422 and AE42 Magnesium Alloys

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.258.530 ◽

2016 ◽

Vol 258 ◽

pp. 530-533

Author(s):

Martin Klein ◽

Patrick Buhr ◽

Frank Walther

Keyword(s):

Magnesium Alloys ◽

Fatigue Behavior ◽

Fatigue Properties ◽

Automotive Applications ◽

Structure Property ◽

Comprehensive Understanding ◽

Corrosion Properties ◽

Application Range ◽

Sodium Chloride Solutions ◽

Structure Property Relationship

Magnesium alloys offer high potential for lightweight constructions, e.g. in automotive applications. However, their application range is limited due to their low corrosion resistance. In the present study, the influence of corrosion on the microstructure and the depending mechanical properties under cyclic loading were characterized for the creep-resistant DieMag422 (Mg4Al2Ba-2Ca) and AE42 magnesium alloys. In this context, fatigue properties in distilled water and sodium chloride solutions were assessed in constant amplitude tests. The results were correlated with corrosion properties of the alloys, which were evaluated by immersion tests. Corrosion-and deformation-induced microstructural changes were observed by light and scanning electron microscopy (SEM), yielding a structure-property-relationship for a comprehensive understanding of mechanical and corrosive deterioration mechanisms.

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New Estimation Method of Fatigue Properties of Aluminum Alloys

Journal of Engineering Materials and Technology ◽

10.1115/1.1562953 ◽

2003 ◽

Vol 125 (2) ◽

pp. 208-214 ◽

Cited By ~ 14

Author(s):

Jun-Hyub Park ◽

Ji-Ho Song

Keyword(s):

Aluminum Alloys ◽

Optimization Technique ◽

Estimation Method ◽

Correlation Method ◽

New Method ◽

Fatigue Properties ◽

Tensile Data ◽

Point Correlation ◽

Quantitative Manner ◽

Life Predictions

A new method on estimating fatigue properties from simple tensile data was proposed for aluminum alloys. The method is based on experimental strain-life curves. An optimization technique was used to get the best fatigue properties. The four-point correlation method, the universal slopes method, Mitchell’s method, the modified universal slopes method, the uniform material law by Ba¨umel and Seeger, the modified four-point correlation method by Ong and a new method proposed in this work were evaluated in a quantitative manner. Mitchell’s method, the uniform materials law and the new method give good life predictions for aluminum alloys. In particular, the new method provided the best results.

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Effect of welding structure on high-cycle and low-cycle fatigue properties for MIG welded A5083 aluminum alloys at cryogenic temperatures

Cryogenics ◽

10.1016/s0011-2275(01)00100-x ◽

2001 ◽

Vol 41 (7) ◽

pp. 475-483 ◽

Cited By ~ 14

Author(s):

Tetsumi Yuri ◽

Toshio Ogata ◽

Masahiro Saito ◽

Yoshiaki Hirayama

Keyword(s):

Aluminum Alloys ◽

Low Cycle Fatigue ◽

Fatigue Properties ◽

Cryogenic Temperatures ◽

Cycle Fatigue

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Pore Size Distribution and the Fatigue Properties of Several Cast Aluminum Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.251 ◽

2010 ◽

Vol 139-141 ◽

pp. 251-254

Author(s):

Yuan Bin Zhang ◽

Hui Luo ◽

Tong Guang Zhai

Keyword(s):

Aluminum Alloys ◽

Pore Size Distribution ◽

Pore Size ◽

Size Distribution ◽

Fatigue Testing ◽

Ambient Air ◽

Fatigue Properties ◽

Materials Testing ◽

Cast Aluminum ◽

Cast Aluminum Alloys

The population and size of porosities in three kinds of cast aluminum alloys, i.e. A713, A356T6-1 and A356T6-2, were statistically measured using a commercial software Spirit, and several distribution functions were tried to fit the cumulative pore size distribution data. It was found that a general extreme value (GEV) distribution function was the most appropriate function to quantify the cumulative pore size distribution in these cast aluminum alloys. The stress-number of cycles to failure (S-N) curves of these alloys were characterized by four point bend fatigue testing on MTS810 materials testing system, with the parameter f=20Hz, R=0.1, and in ambient air. The fatigue strength of A713, A356T6-1 and A356T6-2 aluminum alloy was measured to be 94.5 MPa, 150.6MPa and 117.3MPa respectively. The fatigue properties of these alloys could not be evaluated just by population and size distribution of the pores, the microstructure state, shape and position of pores, and other weakest links that may initiate a fatigue crack should be taken into account synthetically.

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