Mechanism of Crack Nucleation Analysed by In Situ Observation on Mg-Al-Zn Alloy

Gao Feng Quan; Li Ming Cai

doi:10.4028/www.scientific.net/MSF.539-543.1669

Paper Titles

Selected Aspects of Semisolid Forming Magnesium Alloys
p.1644

Properties of AZ31 and AZ91 Sheets Made by Twin Roll Casting
p.1650

Superior Corrosion Resistance and Mechanical Properties of a Mg Alloy Recycled by Solid-State Process
p.1656

Effect of RE Elements and Ni Contents on the Microstructure and Mechanical Properties of Rapidly Solidified Mg Ribbons
p.1662

Mechanism of Crack Nucleation Analysed by In Situ Observation on Mg-Al-Zn Alloy
p.1669

The Influence of Rolling Parameters on Microstructure and Mechanical Properties of the As-Rolled AZ31 Magnesium Alloy Sheet
p.1675

Corrosion Properties of Supersaturated Magnesium Alloy Systems
p.1679

Mechanical Properties and Damping Behavior of Magnesium Alloys Processed by Equal Channel Angular Pressing
p.1685

Development of Conductive Anodic Oxidation Coatings on AZ91D Magnesium Alloy
p.1691

HomeMaterials Science ForumMaterials Science Forum Vols. 539-543Mechanism of Crack Nucleation Analysed by In Situ...

Mechanism of Crack Nucleation Analysed by In Situ Observation on Mg-Al-Zn Alloy

Abstract:

An In Situ observation was made on rolled sheet Mg-Al-Zn alloy (AZ31) in SEM. A type of mini-tensile specimens was used in three typical material orientations, RD (Rolling direction), 45 (45 degrees to rolling direction) and TD (transverse direction, 90 degrees to rolling direction). It is found that the plastic deformation occurred unevenly and limited in single grains, shown by micro extruding steps at grain boundaries. Further deformation concentrated at twinning bands and grain boundaries, more and finer twinning bands appeared as secondary twins on the original ones. In different orientations the dislocation slipping mechanism within twinning bands seems to play a role in different degrees. In RD specimens the slipping mechanism seems predominant, whereas in TD specimens the twinned steps were obvious. Micro cracks nucleated at internal interfaces: grain boundaries, interfaces of twinning bands, and intersections of twinning bands as well.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

1669-1674

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.1669

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Online since:

March 2007

Authors:

Gao Feng Quan, Li Ming Cai

Keywords:

Anisotropy, Crystallographic Texture, Grain Boundary, Magnesium Alloy, Micro Crack Nucleation, Orientation, Plastic Deformation, Sheet, Surface Appearance, Twin

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