The effect of cerium on high-cycle fatigue properties of die-cast magnesium alloy

Very high cycle fatigue (VHCF) properties of high-pressure die cast Magnesium alloy AZ91HP have been investigated. Ultrasonic fatigue tests up to 109 cycles were conducted at the loading frequency of 20 kHz, under R=-1 condition and in ambient air. The experimental results show that specimens fail even after 107 cycles although the scatter seems to be large probably due to the presence of materials defects. However, there seems to be a fatigue limit at about 109 cycles. The fractures contain typical brittle features, with the fatigue cracks seen to initiate from the porosity in the material, either from the surface or beneath.

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Influence of Surface Skin on the Fatigue Properties of Die-Cast Magnesium Alloy AS21X

Materials Science Forum - Materials Structure & Micromechanics of Fracture ◽

10.4028/0-87849-964-4.379 ◽

2005 ◽

pp. 379-382

Author(s):

T.T. Lamark ◽

Miloš Janeček ◽

Yuri Estrin

Keyword(s):

Magnesium Alloy ◽

Fatigue Properties ◽

Die Cast ◽

Cast Magnesium Alloy ◽

Cast Magnesium

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In situ damage assessment in a cast magnesium alloy during very high cycle fatigue

Scripta Materialia ◽

10.1016/j.scriptamat.2010.09.008 ◽

2011 ◽

Vol 64 (1) ◽

pp. 65-68 ◽

Cited By ~ 24

Author(s):

Anish Kumar ◽

Raghavendra R. Adharapurapu ◽

J. Wayne Jones ◽

Tresa M. Pollock

Keyword(s):

Magnesium Alloy ◽

Damage Assessment ◽

High Cycle Fatigue ◽

Cycle Fatigue ◽

Very High Cycle Fatigue ◽

Cast Magnesium Alloy ◽

Cast Magnesium ◽

Very High

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Influence of Surface Skin on the Fatigue Properties of Die-Cast Magnesium Alloy AS21X

Materials Science Forum ◽

10.4028/www.scientific.net/msf.482.379 ◽

2005 ◽

Vol 482 ◽

pp. 379-382 ◽

Cited By ~ 1

Author(s):

T.T. Lamark ◽

Miloš Janeček ◽

Yuri Estrin

Keyword(s):

Magnesium Alloy ◽

Surface Defects ◽

Fatigue Cracks ◽

Surface Condition ◽

Fatigue Properties ◽

Die Cast ◽

Significant Temperature ◽

Fracture Surface Analysis ◽

Cast Magnesium Alloy ◽

Cast Magnesium

The influence of the surface condition and elevated temperature on the fatigue properties of high pressure die cast magnesium alloy AS21X was investigated. Separately cast specimens were tested under tensile cyclic loading, at room temperature and 150°C. With the as-cast surface layer intact, no significant temperature influence on fatigue life was found for large stress amplitudes, whereas the fatigue strength at 107 cycles was found to drop from 50 MPa at 20°C to 40 MPa at 150°C. Fracture surface analysis revealed that the predominant fatigue cracks originated from pre-existing surface defects.

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Effect of Solid Solution Treatment on Fatigue Behavior of Cast Magnesium Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.281.436 ◽

2013 ◽

Vol 281 ◽

pp. 436-440

Author(s):

You Yang ◽

Hua Wu ◽

Zhao Feng Xuan

Keyword(s):

Solid Solution ◽

Magnesium Alloy ◽

Fatigue Fracture ◽

High Cycle Fatigue ◽

Fatigue Behavior ◽

Solution Treatment ◽

Cycle Fatigue ◽

Solid Solution Treatment ◽

Cast Magnesium Alloy ◽

Cast Magnesium

The effects of solid solution treatment on high cycle fatigue behavior of cast magnesium alloy AZ91D were investigated using an up-and-down load method. High cycle fatigue tests were carried out up to 107cycles at a stress ratio R=0.1 and frequency of 90Hz on specimens using a high frequency fatigue machine. The results showed that the fatigue strength of cast AZ91D magnesium alloy increase from 54.5Mpa to 71.5Mpa after solid solution treatment (T4) at 415°C, keeping temperature 16hours. The micro-fatigue fracture surface of alloy included fatigue initiation area, fatigue crack propagation area and fatigue fracture area. Fatigue crack of the alloys initiate principally at inclusions and shrinks under subsurface. The fatigue fracture of test specimens show the rupture characteristics of quasi-cleavage(as-cast alloy) and toughness(T4 alloy), respectively.

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