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:
After surface mechanical attrition treatment (SMAT) for Al-Zn-Mg alloy, a gradientstructure with average grain size increased from 20nm in surface layer to about 100nm at a depth of20μm was formed. The thermal stability of surface nanostructured layer in Al-Zn-Mg alloy sampleswas investigated by vacuum annealing at 100°C, 150°C, 200°C and 250°C for 1h, respectively. Themicrostructural evolution as well as the microhardness along the depth from top surface layer tomatrix of SMATed samples was analyzed. Experimental results showed that the grain size of surfacenanocrystallites remains in submicro-scale, ranging from 300nm to 400nm, when annealed at atemperature of 250°C, and the microhardness of surface nanostructured layer was still high comparedwith that of matrix, indicating satisfying thermal stability of nanocrystallized layer. This might beattributed to the presence of substantive trident grain boundaries and pinning effect of dispersiveprecipitated phases in nanocrystalline materials, which hindered the grain boundary migration thatleading to grain growth
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1129.pdf
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