Mold-Filling Characteristics of AZ91 Magnesium Alloy in the Low-Pressure Expendable Pattern Casting Process

The monotonic and cyclic behavior of five different casting processes for AZ91 magnesium alloy is evaluated through microstructure characterization and mechanical testing. A passenger car control arm was cast by squeeze cast, low pressure permanent mold, low pressure permanent mold-electricmagnetic-pump, T-mag, and ablation processes. Samples were cut from twelve locations of the control arm for microstructure characterization. The grain size, porosity fraction, and porosity size were measured via optical microscopy. Different types and sizes of defects were present in each type of casting processes. The mechanical behavior characterization included monotonic tension, and fully-reversed fatigue tests. Sources of fatigue crack initiation were quantified using scanning electron microscopy. For both monotonic and cyclic loading conditions, poor mechanical performance was directly linked to the presence of large pores, oxide films, and/or pore shrinkage clusters.

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Microstructure and mechanical properties of low pressure cast AZ91 magnesium alloy

International Journal of Microstructure and Materials Properties ◽

10.1504/ijmmp.2007.015319 ◽

2007 ◽

Vol 2 (3/4) ◽

pp. 429

Author(s):

A. Srinivasan ◽

U.T.S. Pillai ◽

B.C. Pai

Keyword(s):

Mechanical Properties ◽

Magnesium Alloy ◽

Low Pressure ◽

Az91 Magnesium Alloy ◽

Microstructure And Mechanical Properties ◽

Az91 Magnesium

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Mold-filling characteristics and solidification behavior of magnesium alloy in vacuum suction casting process

Journal of Materials Science ◽

10.1007/s10853-009-3795-y ◽

2009 ◽

Vol 44 (20) ◽

pp. 5644-5653 ◽

Cited By ~ 4

Author(s):

Haitao Teng ◽

Tingju Li ◽

Xiaoli Zhang ◽

Fudong Bai ◽

Kai Qi

Keyword(s):

Magnesium Alloy ◽

Casting Process ◽

Mold Filling ◽

Solidification Behavior ◽

Vacuum Suction ◽

Suction Casting ◽

Filling Characteristics

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Mechanical Properties of Twin Roll Cast AZ91 Magnesium Alloy at Room Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.145 ◽

2007 ◽

Vol 26-28 ◽

pp. 145-148 ◽

Cited By ~ 1

Author(s):

Shu Hei Uchida ◽

Ippei Takeuchi ◽

Gentaro Gonda ◽

Kinji Hirai ◽

Tokuteru Uesugi ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloy ◽

Room Temperature ◽

Cast Alloy ◽

Casting Process ◽

Az91 Magnesium Alloy ◽

Die Cast ◽

Az91 Magnesium ◽

Twin Roll Cast ◽

Twin Roll

Twin roll casting process combines casting and hot rolling into a single process. In this study, mechanical properties at room temperature and microstructure of the twin roll cast AZ91 magnesium alloy are investigated. The alloy exhibited a good combination of high ultimate strength of 343MPa, yield stress of 224MPa and elongation to failure of 13%. The mechanical property was very excellent compared with AZ91 die-cast alloy. EPMA analysis reveals that the Al concentration in Mg matrix is higher in twin roll cast alloy than that in die-cast alloy. This high Al concentration must be the origin of the good mechanical properties of twin roll cast alloy at room temperature.

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Magnesium Alloy Strip Produced by a Melt-Conditioned Twin Roll Casting Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.690.129 ◽

2011 ◽

Vol 690 ◽

pp. 129-132 ◽

Cited By ~ 3

Author(s):

Iman Bayandorian ◽

Yan Huang ◽

Geoff M. Scamans ◽

Zhong Yun Fan

Keyword(s):

Magnesium Alloy ◽

Tensile Elongation ◽

Casting Process ◽

Downstream Processing ◽

Alloy Strip ◽

Az91 Magnesium Alloy ◽

Twin Roll Casting ◽

Roll Casting ◽

Az91 Magnesium ◽

Twin Roll

Melt conditioning by intensive shear was used prior to twin roll casting of an AZ91 magnesium alloy strip to promote heterogeneous nucleation and produce a refined and uniform microstructure without severe macro-segregation. The as-cast strip was then processed by homogenization, hot rolling and annealing and the microstructural behaviour during the downstream processing was examined and compared with the strip of the same alloy produced without melt conditioning. The melt conditioned strip after downstream processing displayed significantly improved mechanical properties with an average tensile elongation of ~16%, compared with ~10% for the strip produced without melt conditioning and the reported values of ~1.5-6.2% in the literature.

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