ISSN:
1013-9826
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:
MgAl2O4 layer with several decade nano-meter in thickness was coated uniformly onAl18B4O33 whisker by vapor-deposition of pure magnesium in vacuum and then heat-treated inatmosphere in order to prevent to the direct reaction between Al18B4O33 whisker and molten ZK60(Mg-(4.8-6.2)%Zn-(0.45-0.8)%Zr) alloy in preparing the composites. By the coating, the compositehave no interfacial reaction in whisker and matrix. As the consumption of Zn at the interface wasnot observed during preparation of the composites, the composites have good aging behavior, butshowed the shortening of the time to reach the peak hardness. As the cooling speed of the compositeafter solution treatment is slow because of low thermal conductivity of the composites, someprecipitation (MgZn2) was observed in the composites. Furthermore, the precipitation grew aroundthe interface between whisker and matrix preferentially because of thermal stress around theinterface. It seems these phenomena affect to the shortening of the time to reach the peak hardness
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1673.pdf