ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Effect of microstructure on micro-cracking behavior of Al-Mg-Si alloy extrusions during axialcompressive deformation was studied. Extrusions of Al-Mg-Si alloys with two differentcompositions were used for the mechanical tests and microstructure observation. Compressive loadswere applied parallel to the axes of the tubular specimens with rectangular cross section. Asdeformation proceeded, the specimens changed their shape into bellows-like ones. Specimens withfiner grains showed higher critical strength and strain for crack initiation. Microscopic observationshowed that cracks initiated at the bulge surface of the bellows and propagated into the depth. Theobserved behavior of crack initiation and propagation was interpreted in connection with those insimple tensile tests. The stress and strain at the crack initiation site of the bulge were assumed tocorrespond to the tensile strength of the alloy. The effect of grain size on the crack behavior waswell explained by the grain size dependence of stress concentration at grain boundaries due todislocation pile-ups. The effects of over-aging on the microstructure and crack initiation behaviorwere also discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.895.pdf
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