A modified cone calorimeter with an enclosure has been developed for measuring the yield of combustion products including CO and smoke under vitiated conditions. The CO yields of methane, propane, PMMA, ABS, polyethylene, and Douglas fir are found to increase by at least a factor of two as the oxygen concentration is decreased from 21% to 14%, while the smoke yields are found to be insensitive to vitiation for the solid materials (less than 30% change).Results for air vitiated separately by nitrogen and by carbon dioxide suggest that the CO yield for a given fuel in a free burn is mainly controlled by the flame temperature. For ambient conditions, the CO yields for the solid samples are about a factor of 2.3 smaller than the smoke yields for all the solid materials studied.

The mechanical properties of Al-10%Si-Mg system alloys containing Mn up to 1.5% fabricated by selective laser melting (SLM) with preheat temperature of 160°Cor 200°Cfor 15hours were studied by means of tensile test, hardness measurement and DSC analysis. The strength of the Mn added alloys was about 100 to 150MPa higher than that of the Mn free alloy. The bottom of the 1.5%Mn added alloy showed about 500MPa and 400MPa under preheat condition of 160°C and 200°C, respectively. Many compounds containing Si with size of about 40nm were observed at the bottom of the 1.5%Mn added alloy with preheat temperature of 200°C by STEM-BF image. Mn enriched zone was observed at eutectic (α-Al, Si) area of the 1.5%Mn added alloy by STEM-EDS. It is possible that Mn enriched zone directly or indirectly causes the high strength.