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Chang, Si Young,Kamio, Akihiko 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.1
The effect of thermal cyclings on mechanical properties at room and some elevated temperatures of SiC whisker-reinforced magnesium-matrix composites produced by squeeze casting and hot extrusion are clarified. Subsequent thermal cycling produces internal stress at the matrix/SiC whisker interfaces causing fatigue. The mechanical properties of composites are more influenced by the low thermal cycling of 298 K↔77 K than the high thermal cycling 673 K↔298 K. The high thermal cycling of 673 K↔298 K has only a slight affect on such mechanical properties as tensile strength and proof stress at temperatures lower than 473 K. However, at 473 K and 573 K, the thermal cyclings there almost no influence on the mechanical properties of SiC whisker reinforced AE42 alloy-matrix composites.
A New Technology for the Production of Aluminum Matrix Composites by the Plasma Synthesis Method
Lee, Chang Gil,Kang, Suk Bong,Kamio, Akihiko,Lee, Jung Moo 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.4
Aluminum matrix composites were produced via the plasma injection of reinforcing particulates into aluminum melts stirred electromagnetically. In this process, a metallic wire supplied to the active zone of plasma torch disintegrated into fine metallic particles. In the plasma arc, the particles are heated above the melting point and accelerated to close to sonic speed, which helps with the incorporation of the particles into the melt. In this study, the possibility of producing aluminum matrix composites reinforced by intermetallic compound particles via plasma synthesis is demonstrated.
미량 Cr 및 Ti 를 함유하는 Al-Mg-Si 합금의 용질편석과 석출조직
최정철,수총유강,신미창언,고교항부,류성곤 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.5
In Al-1.1wt%Mg-0.68wt%Si alloy the effect of Cr and Ti additions on precipitation behavior of the homogenized and/or aged specimens has been investigated homogenizing. Ephase(Al, Mg, Cr₂) is preferentially precipitated around Mg₂Si and distributed unevenly near a cored dendrite structure. With the addition of Cr and Ti the aged microstructure has indicated that the coarsening of needle-shaped G. P. zone and rod-shaped intermediate phase(β') is delayed, and transition from needle-shaped G. P. zone to β' phase is, thus, delayed. This in turn, caused deceleration of the hardness decrease rate during overaging.