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:
Crack growth in AA6060 after two and eight equal-channel angular extrusions (ECAE),showing a bimodal microstructure and a homogenous ultrafine-grained microstructure, respectively,are compared to the coarse grained counterpart. Furthermore, an optimized condition, obtained bycombining one ECA-extrusion and a subsequent short aging treatment is included. Fatigue crackgrowth behaviour in the near-threshold regime and the region of stable crack growth is investigatedand related to microstructural features such as grain size, grain size distribution, grain boundarycharacteristics and ductility. Micrographs of crack propagation surfaces reveal information on crackpropagation features such as crack path deflection and give an insight to the underlyingmicrostructure. Instrumented Charpy impact tests are performed to investigate crack initiation andpropagation under impact conditions. Due to the recovery of ductility during the post-ECAE heattreatment, the optimized condition shows improved fatigue crack properties and higher energyconsumption in Charpy impact tests, when compared to the as-processed conditions without heattreatment
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.815.pdf
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