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Open AccessArticle

Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology

1
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
2
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
3
Department of Civil Engineering & Mechanics, Sichuan University, Chengdu 610065, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1700; https://doi.org/10.3390/ma11091700
Received: 24 July 2018 / Revised: 29 August 2018 / Accepted: 7 September 2018 / Published: 13 September 2018
The low cycle fatigue tests on the crack initiation and propagation of cast magnesium alloys with two small holes were carried out by using in-situ scanning electron microscope (SEM) observation technology. The fatigue crack propagation behaviors and fatigue life, which are affected by two small artificial through holes, including the distances between two holes and their locations, were discussed in detail based on the experimental results and the finite element analysis (FEA). The results indicated that the fatigue multi-cracks occurred chiefly at the edges of two holes and the main crack propagation was along the weak dendrite boundary with the plastic deformation vestiges on the surface of α-Mg phase of cast AM50 and AM60B alloys. The fatigue cracking characteristics of cast AZ91 alloy depended mainly on the brittle properties of β-Mg17Al12 phase, in which the multi-cracks occurred still at the edges of two holes and boundaries of β-Mg17Al12 phase. The fatigue crack initiation position of cast magnesium alloys depends strongly on the radius of curvature of through hole or stress concentration factor at the closed edges of two through holes. In addition, the fatigue multi-cracks were amalgamated for the samples with titled 45° of two small holes of cast Mg-Al alloys when the hole distance is less than 4D (D is the diameter of the small hole). View Full-Text
Keywords: cast magnesium alloy; hole and notch; fatigue crack; fatigue life; in-situ SEM technology cast magnesium alloy; hole and notch; fatigue crack; fatigue life; in-situ SEM technology
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Wang, X.-S.; Tan, C.-H.; Ma, J.; Zhu, X.-D.; Wang, Q.-Y. Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology. Materials 2018, 11, 1700.

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