采用机械合金化方法制备了Al82Fe5Zr5Ce8非晶态合金,用扫描电镜、X射线衍射、差热分析等方法分析了非晶态合金Al82Fe5Zr5Ce8的形貌、结构、热稳定性。结果表明:Al82Fe5Zr5Ce8混合粉末经过机械合金化球磨200h后达到了非晶状态。热分析表...采用机械合金化方法制备了Al82Fe5Zr5Ce8非晶态合金,用扫描电镜、X射线衍射、差热分析等方法分析了非晶态合金Al82Fe5Zr5Ce8的形貌、结构、热稳定性。结果表明:Al82Fe5Zr5Ce8混合粉末经过机械合金化球磨200h后达到了非晶状态。热分析表明非晶态Al82Fe5Zr5Ce8合金的晶化分两阶段进行,在723K和783K经8h的退火后,非晶态Al82Fe5Zr5Ce8合金达到了完全晶化状态,该状态下出现了很多种中间化合物相,经不同温度退火后晶化产物相基本相同。利用Kissinger方程分析了两个晶化过程的晶化激活能,对应过程的晶化激活能分别是475.6 k J/mol和408.8 k J/mol。展开更多
Al86Ni7Y4.5Co1La1.5 （mole fraction, %） alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated by vacuum hot press sintering and spark plasma sintering...Al86Ni7Y4.5Co1La1.5 （mole fraction, %） alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated by vacuum hot press sintering and spark plasma sintering （SPS） under different process conditions. The microstructure and morphology of the powder and consolidated bulk sample were examined by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. It is shown that amorphous phase appears when ball milling time is more than 100 h, and the bulk sample consolidated by SPS can maintain amorphous/ nanocrystalline microstructure but has lower relative density. A compressive strength of 650 MPa of Al86Ni7Y4.5Co1La1.5 nanostructured samples is achieved by vacuum hot extrusion （VHE）.展开更多
文摘采用机械合金化方法制备了Al82Fe5Zr5Ce8非晶态合金,用扫描电镜、X射线衍射、差热分析等方法分析了非晶态合金Al82Fe5Zr5Ce8的形貌、结构、热稳定性。结果表明:Al82Fe5Zr5Ce8混合粉末经过机械合金化球磨200h后达到了非晶状态。热分析表明非晶态Al82Fe5Zr5Ce8合金的晶化分两阶段进行,在723K和783K经8h的退火后,非晶态Al82Fe5Zr5Ce8合金达到了完全晶化状态,该状态下出现了很多种中间化合物相,经不同温度退火后晶化产物相基本相同。利用Kissinger方程分析了两个晶化过程的晶化激活能,对应过程的晶化激活能分别是475.6 k J/mol和408.8 k J/mol。
基金Project(2012CB619503)supported by the National Basic Research Program of ChinaProject(2013AA031001)supported by the National High Technology Research and Development Program of ChinaProject(2012DFA50630)supported by the International Science&Technology Cooperation Program of China
文摘Al86Ni7Y4.5Co1La1.5 （mole fraction, %） alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated by vacuum hot press sintering and spark plasma sintering （SPS） under different process conditions. The microstructure and morphology of the powder and consolidated bulk sample were examined by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. It is shown that amorphous phase appears when ball milling time is more than 100 h, and the bulk sample consolidated by SPS can maintain amorphous/ nanocrystalline microstructure but has lower relative density. A compressive strength of 650 MPa of Al86Ni7Y4.5Co1La1.5 nanostructured samples is achieved by vacuum hot extrusion （VHE）.
