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Acta Metall Sin  2014, Vol. 50 Issue (6): 715-721    DOI: 10.3724/SP.J.1037.2014.00021
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EFFECT OF ANODIZING TREATMENT ON BENDING FATIGUE PROPERTIES OF 2014-T6 ALUMINIUM ALLOY
ZHANG Yanbin, ZHANG Limin(), ZHANG Jiwang, ZENG Jing
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031
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ZHANG Yanbin, ZHANG Limin, ZHANG Jiwang, ZENG Jing. EFFECT OF ANODIZING TREATMENT ON BENDING FATIGUE PROPERTIES OF 2014-T6 ALUMINIUM ALLOY. Acta Metall Sin, 2014, 50(6): 715-721.

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Abstract  

Anodizing treatment was performed on the notched portion of fatigue specimens of the 2014-T6 aluminium alloy. The thicknesses of the oxide layer induced by the treatment were 5, 10 and 20 μm, respectively. Fatigue tests were carried out on the specimens with and without anodizing treatment using a rotating bending fatigue machine. According to experimental results, the effect of anodizing treatment on the bending fatigue properties of the aluminium alloy was analyzed. In addition, the dependence of the bending fatigue properties of the material upon the thickness of the oxide layer was discussed. The results indicate that the anodizing treatment decreases the bending fatigue life of the aluminium alloy under low and medium stress. With increasing thickness of the oxide layer, the crack initiation site transfers from the oxide layer surface to the substrate surface and the bending fatigue life of the alloy decreases; however, when the oxide layer thickness increases to a certain extent, the S-N curve above the fatigue limit of the alloy does not change even if the thickness continues to increase.
Key words:  aluminium alloy      anodizing treatment      thickness of the oxide layer      fatigue property      fatigue limit     
Received:  08 January 2014     
ZTFLH:  TG146.2  
  TG115.5  
Fund: Supported by National Natural Science Foundation of China (No.51305363)
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Yanbin ZHANG
Limin ZHANG
Jiwang ZHANG
Jing ZENG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2014.00021     OR     https://www.ams.org.cn/EN/Y2014/V50/I6/715

Fig.1  Schematic of shape and dimensions of fatigue specimen (unit: mm)
Fig.2  SEM images of fatigue specimen surfaces on notched portion

(a) surface without anodizing treatment (sample No.1)

(b) surface with oxide layer 5 μm (sample No.2)

(c) surface with oxide layer 10 μm (sample No.3)

(d) surface with oxide layer 20 μm (sample No.4)

Fig.3  S-N curves of fatigue specimens
Fig.4  Schematic of stress distribution on the cross-section of material with oxide layer
σa / MPa 5 μm 10 μm 20 μm
350 1.60 2.27 3.21
300 1.37 1.94 2.75
275 1.26 1.78 2.52
250 1.15 1.62 2.29
225 1.03 1.46 2.06
200 0.92 1.30 1.83
Table 1  Relationship between stress intensity factor (ΔK)and initial crack depth (thickness of oxide layer)

(MPa·m1/2)

Fig.5  Fracture morphologies of fatigue sample No.1 (σa=300 MPa, Nf=99510 cyc)

(a) macroscopic fracture surface

(b) enlarge image of crack initiation site in Fig.5a

Fig.6  Fracture morphologies of fatigue sample No.2 (σa=300 MPa, Nf=42640 cyc)

(a) macroscopic fracture surface

(b) enlarge image of crack initiation site in Fig.6a

Fig.7  Fracture morphologies of fatigue sample No.3 (σa=300 MPa, Nf=19420 cyc)

(a) macroscopic fracture surface

(b) enlarge image of crack initiation site in Fig.7a

Fig.8  Fracture morphologies of fatigue sample No.4 (σa=300 MPa, Nf=24670 cyc)

(a) macroscopic fracture surface

(b) enlarge image of crack initiation site in Fig.8a

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