• Journal of Powder Materials
• /
• v.8 no.1
• /
• pp.42-49
• /
• 2001

Ti-50Ni(at%) and Ti-40Ni-10Cu(at%) alloy powders have been fabricated by ball milling method, and their microstructure and phase transformation behavior were investigated by means of scanning electron microscopy/energy dispersive spectrometry, differential scanning calorimetry (DSC), X-ray diffractions and transmission electron microscopy. In order to investigate the effect of ball milling conditions on transformation behavior, ball milling speed and time were varied. Ti-50Ni alloy powders fabricated with the milling speed more than 250 rpm were amorphous, while those done with the milling speed of 100rpm were crystalline. In contrast to Ti-50Ni alloy powders, Ti-40Ni-10Cu alloy powders were crystalline, irrespective of ball milling conditions. DSC peaks corresponding to martensitic transformation were almost discernable in alloy powders fabricated with the milling speed more than 250 rpm, while those were seen clearly in alloy powders fabricated with the milling speed of 100 rpm. This was attributed to the fact that a strain energy introduced during ball milling suppressed martensitic transformation.

• Journal of Korean Vacuum Science & Technology
• /
• v.2 no.2
• /
• pp.118-121
• /
• 1998

Diisopropylselenide (DIPSe) is employed for the metalorganic vapor phase epitaxy (MOVPE) of ZnSe in order to eliminate premature gas phase reaction while maintaining negligible carbon incorporation and preserving relatively low growth temperature. In combination with dimethylzinc, single crystalline ZnSe layers were grown on GaAs at temperature around 450$^{\circ}C$. Secondary ion mass spectrometry showed a negligible carbon incorporation in ZnSe films grown from DIPSe even at high [Ⅵ]/[II] ratios, in contrast of a carbon concentration of 1021 cm-3 in ZnSe films grown from diallyselenide (DASe). Crystalline and interface quality are demonstrated by secondary electron microscopy, secondary ion mass spectroscopy and double crystal X-ray diffraction.

• Journal of the Korean Ceramic Society
• /
• v.14 no.4
• /
• pp.248-255
• /
• 1977

The effect of firing temperature, soaking time and batch composition upon the glass phase and pore formation as well as their distribution in slag foamed glass was investigated. Sulfur dioxide gas produced by the oxidation and reduction of metal sulfide in waterslag was attributed to foam forming agent. Slag foamed glass matrix was mainly composed of 35~60% glas phase and melilite crystalline phase. The increment of bentonite addition in batch lowered the foam forming temperature in studied system. The result showed also that the foam size distribution was broadened as th firing temperature wa inbereased.

• Journal of Powder Materials
• /
• v.18 no.2
• /
• pp.168-171
• /
• 2011

We investigate grain growth behavior of poly-crystalline Mg sheet having strong basal fiber texture using phase field model for grain growth and micro-elasticity. Strong initial basal texture was maintained when external load was not imposed, but was weaken when external biaxial strain was imposed. Elastic interaction between elastic anisotropy of Mg grain and external load is the reason why texture evolution occurs.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2007.05a
• /
• pp.196.1-196.1
• /
• 2007

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.05a
• /
• pp.111-111
• /
• 2002

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1992.05b
• /
• pp.154-154
• /
• 1992

• Journal of the Korean Ceramic Society
• /
• v.33 no.12
• /
• pp.1347-1352
• /
• 1996

• 한국전자현미경학회:학술대회논문집
• /
• 2007.05a
• /
• pp.94-95
• /
• 2007

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2000.11a
• /
• pp.123-123
• /
• 2000