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:
An ultra-fine grained Al-1.5Mn alloy was fabricated in an oversaturated and a precipitated(Al6Mn particle) state by confined channel-die pressing (CCDP) at room temperature (RT).Specimens for microcharacterization and mechanical tests were taken from the centre area of theCCDP samples, where an equivalent strain of ε ≈1-1.4 was reached for one pass pressing. Thesamples were subjected to CCDP for 1, 4, 8 and 16 passes, respectively. The microstructure evolutionduring CCDP was investigated by transmission electron microscopy (TEM). The deformationbehaviour of the ultra-fine grained Al-Mn alloy after the CCDP process was determined bycompression tests at RT with different strain rates of ε& = 1× 10-4s-1, ε& = 5× 10-4s-1 and ε& = 1× 10-3s-1.The results demonstrated that the alloy with Al6Mn precipitates had a larger grain size, higher yieldstrength, a larger Hall-Petch coefficient, a stronger strain softening, a larger strain rate sensitivity anda smaller activation volume after CCDP compared to the oversaturated alloy. These phenomenaindicate that second phase particles and solute element affect grain refinement and mechanicalbehaviour during and after CCDP differently
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.697.pdf
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