作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《粉末冶金材料科学与工程》 2005年第1期40-44,共5页

摘　　要： 采用紧耦合惰性气体雾化技术制备具有非晶和纳米晶结构的Al82Ni10Y8(%)合金粉末, 粒径小于26μm粉末为非晶和纳米晶结构, 而粒径小于15μm粉末为非晶单相结构。在250, 310, 360, 400, 450℃5个不同温度下对粉末进行了超高压固结成形, 并对致密化后合金的显微结构进行了分析。致密化后粉末颗粒基本保持原有粉末形貌, 但随着致密化温度的升高, 晶化和晶化相长大愈发明显, 合金密度呈增高趋势。对粉末致密化的机理进行了讨论, 认为非晶相的粘滞流动是低温下获得高致密度的主要原因。 Amorphous and nanocrystalline Al_~82 Ni_~10 Y_8(mole fraction, %) alloy powders were gas-atomized via close-coupled nozzle atomizer. Powder with particle diameter below 26μm was determined to be of amorphous and nanocrystalline structure, while powder smaller than 15μm was fully amorphous. The as-atomized powder was consolidated under ultra-high pressure at 5 different temperatures, namely 250, 310, 360, 400 and 450℃. The microstructure of the bulk alloys was analyzed in detail. Most powder remained the initial shape after consolidation. With the consolidation temperature increased, crystallization and growth of crystals became more obvious, and density of bulk alloys increased. Densification mechanism of powder was also discussed and the viscous flow of amorphous phases was considered to contribute most to the high degree of densification at low temperature.

关 键 词： 超高压固结成形 雾化粉末 致密化 非晶

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]