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题名: Low-cycle fatigue properties and life prediction of Al-Si piston alloy at elevated temperature
作者: Wang, M.;  Pang, J. C.;  Li, S. X.;  Zhang, Z. F.
发表日期: 2017-9-17
摘要: The influences of temperature on the microstructure evolution, tensile properties, especially low-cycle fatigue (LCF) behaviors and damage mechanisms of Al-Si piston alloy have been investigated in this paper. The results show that the alloy exhibits cyclic softening at high-temperature. Fatigue cracks usually initiate from primary silicon phase and preferentially grow along particles in a slightly zigzag path at relatively low temperature. With temperature increasing, however, the ductile tearing fracture through micro-cracks can be found. In order to evaluate the fatigue life, considering the temperature and loading conditions, a comprehensive 3-parameter model based on hysteresis energy has been proposed; at a constant temperature the fatigue life can be controlled by two parameters, i.e., the intrinsic fatigue toughness W-0 (the resistance to crack propagation) and the fatigue cracking exponent beta (the resistance to fatigue cracking), which dominate the LCF damage mechanisms (from fatigue-induced particle cracking to rapid fatigue crack growth). For the current Al-Si alloy, the combined effect of W-0, beta and temperature T can lead to an optimal fatigue life at a critical temperature. This model provides a new clue for optimizing and designing the high-temperature materials.
刊名: ELSEVIER SCIENCE SA
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Wang, M.,Pang, J. C.,Li, S. X.,et al. Low-cycle Fatigue Properties And Life Prediction Of Al-si Piston Alloy At Elevated Temperature[J]. Elsevier Science Sa,2017,704:480-492.

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