Effect of Loading Path on Fatigue Behavior of A319 Cast Aluminum Alloy

doi:10.11901/1005.3093.2014.124

Chinese Journal of Materials Research

2014, Vol. 28

Issue (10): 756-762 DOI: 10.11901/1005.3093.2014.124

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Effect of Loading Path on Fatigue Behavior of A319 Cast Aluminum Alloy

Dandan TIAN,Guoqiu HE(

),Yue SHEN,Xiaoshan LIU,Kangle FAN,Defeng MO

School of Materials Science and Engineering, Tongji University, Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Shanghai 201804

Cite this article:

Dandan TIAN,Guoqiu HE,Yue SHEN,Xiaoshan LIU,Kangle FAN,Defeng MO. Effect of Loading Path on Fatigue Behavior of A319 Cast Aluminum Alloy. Chinese Journal of Materials Research, 2014, 28(10): 756-762.

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Abstract

The fatigue behavior of A319 cast aluminum alloy was investigated in terms of its cycle stress response characters and fatigue life under a 0.2% strain amplitude with several loading paths, such as uniaxial, proportional and non-proportional ones. While the fracture characters of failed specimen and the cracking modes of Si particles were also investigated. Under the condition of same equivalent stress, the effectiveness of the three loading paths on the hardening of the alloy in terms of the degree and rate of hardening may be ranked in an order of high to low as follows: non-proportional > proportional > uniaxial, corresponding with the fatigue life exactly. The fractography of the alloy presented two major cracks with the herringbone pattern under the proportional loading. Additionally, the crack initiation site was gradually blurred when the loading path changing from uniaxial, to proportional and then to nonproportional ones, in the meanwhile the size of the crack initiation site and propagation region also decreased. The crack surface basically paralleled to the loading direction under uneasily loading, however, multi-cracks with different directions occurred under multi-axial loading.

Key words: metallic materials A319 cast aluminum alloy loading path fatigue properties

Received: 19 March 2014

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	Dandan TIAN
	Guoqiu HE
	Yue SHEN
	Xiaoshan LIU
	Kangle FAN
	Defeng MO

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.124 OR https://www.cjmr.org/EN/Y2014/V28/I10/756

Table 1 Chemical composition of A319 alloy with Sr-modification (mass fraction, %)

Fig.1 Geometry of fatigue specimen (mm) (a) uniaxial loading, (b) multi-axial loading

Fig.2 Schematic diagram of multi-axial loading path

Fig.3 Microstructure of A319 aluminum alloy before (a) and after (b) Sr-modification

Table 2 Mechanical properties of A319 before and after Sr-modification

Fig.4 Stress amplitude- number of cycles curves of A319 alloy with Sr-modification under different loading path (Δε_t/2=0.2%)

Table 3 Fatigue life of A319 alloy with Sr-modification under different loading path Δε_t/2 =0.2%

Fig.5 Fractography of the alloy under different loading path (Δε_t/2 =0.2%) (a) tensile, (b) uniaxial, (c) proportional, (d) nonproportional, (e) tensile, (f) proportional

Fig.6 Initiation morphologies of fatigue cracks (Δε_t/2 =0.2%) (a) uniaxial, (b) proportional, (c) nonproportional

Fig.7 Propagation morphologies of fatigue cracks (Δε_t/2 =0.2%) (a) uniaxial, (b) proportional, (c) nonproportional

Fig.8 Damage morphologies of fatigue cracks (Δε_t/2 =0.2%) (a) uniaxial, (b) proportional, (c) nonproportional

Fig.9 Fracture of Si particles near the main fracture surface (Δε_t/2 =0.2%)

Fig.10 Effect of Si particle to crack initiation and propagation of A319 with Sr-modification (Δε_t/2 =0.2%), (a) uniaxial, (b) proportional, (c) nonproportional, (d) amplification of Fig.(c)

Fig.11 Cracking modes of Si particles (Δε_t/2 =0.2%) (a) uniaxial, (b) proportional, (c) nonproportional

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