Al62.5Cu25Fe12.5 alloy was prepared by arc melting. It was found that the formation of quasicrystalline phase is related to the condition of annealing, such as temperature and duration. Weight gain of AI-Cu-Fe quasicr...Al62.5Cu25Fe12.5 alloy was prepared by arc melting. It was found that the formation of quasicrystalline phase is related to the condition of annealing, such as temperature and duration. Weight gain of AI-Cu-Fe quasicrystal during the oxidation at 700 and 800℃ in dry air was measured by means of thermal balance. The oxidation kinetics showed that the quasicrystal has good oxidation resistance. Only α-Al2O3 was formed on Al62.5Cu25Fe12.5 quasicrystal. The surface morphologies of AI-Cu-Fe quasicrystal after isothermal oxidation for different times were observed.展开更多
An oxidation resistant Al-Cu-Fe quasicrystalline coating was fabricated on substrate of Ti alloy by low pressure plasma spraying (LPPS) method. As-sprayed Al-Cu-Fe coating has a rapidly solidified lamellar microstruct...An oxidation resistant Al-Cu-Fe quasicrystalline coating was fabricated on substrate of Ti alloy by low pressure plasma spraying (LPPS) method. As-sprayed Al-Cu-Fe coating has a rapidly solidified lamellar microstructure consisting of quasicrystalline phase and crystalline phase. The formation of quasicrystalline coating is related to the annealing. The results from the ox!dat!on experiments showed that Al-Cu-Fe quasicrystalline coating improved the oxidation resistance of Ti-base alloys. During the oxidation period there is no evident spallation of the coating from the substrate. Oxide formed on the surface of Al-Cu-Fe quasicrystalline coating after oxidation consisted of Al2O3. Oxidation occurs Ieading to a change of concentration and phase transformation in the coating surface. Selective oxidation of AI transforms the quasicrystalline phase into the phase.展开更多
Microstructure and phase transformation in the Al-Cu-Fe alloys of the approximate compositional range of 20 - 50 at.% Cu and 2 - 10 Fe at.% have been investigated from samples quenched from their respective temperatur...Microstructure and phase transformation in the Al-Cu-Fe alloys of the approximate compositional range of 20 - 50 at.% Cu and 2 - 10 Fe at.% have been investigated from samples quenched from their respective temperatures by means of different thermal analysis, magnetothermal analysis, scanning electron microscopy, electron probe analysis and powder X-ray diffraction. Representative phase transformations categorized as polymorphic, discontinuous precipitation, quasi-binary eutectoid, and ternary transitional U-type phase transformation are presented. These phase transformations were found to have a common feature which consumes the phase and appears the phase. A schematic diagram was proposed to demonstrate the transition processes with decreasing temperature.展开更多
采用DMD-450真空镀膜仪将Al65Cu20Fe15准晶粉末沉积在Q235钢表面制备薄膜。研究了二氧化铈对薄膜的组织和结构的影响。采用透射电镜（TEM）、扫描电镜（SEM）、X射线衍射仪（XRD）等分析了薄膜的组织结构和表面形貌。利用纳米压痕仪（MT...采用DMD-450真空镀膜仪将Al65Cu20Fe15准晶粉末沉积在Q235钢表面制备薄膜。研究了二氧化铈对薄膜的组织和结构的影响。采用透射电镜（TEM）、扫描电镜（SEM）、X射线衍射仪（XRD）等分析了薄膜的组织结构和表面形貌。利用纳米压痕仪（MTS）测试了薄膜的显微硬度和弹性模量。结果表明：通过准晶粉末真空蒸镀可以形成准晶薄膜。其组成相有CuAl2，A1Cu3 and I（Al65Cu20Fe15）相等。薄膜的成分取决于制备工艺。二氧化铈对薄膜的结构没有产生明显的影响。但是薄膜的显微硬度和弹性模量随二氧化铈添加量的增加而提高。当二氧化铈添加量为5％（质量分数）时，薄膜的显微硬度达到9．0GPa，弹性模量最高达到190GPa。此外，二氧化铈的添加明显增加了薄膜的耐蚀性能。展开更多
基金The Aviation Science Foundation of China is acknowledged forfinaricial aupport urder Grant No.0OH51006.
文摘Al62.5Cu25Fe12.5 alloy was prepared by arc melting. It was found that the formation of quasicrystalline phase is related to the condition of annealing, such as temperature and duration. Weight gain of AI-Cu-Fe quasicrystal during the oxidation at 700 and 800℃ in dry air was measured by means of thermal balance. The oxidation kinetics showed that the quasicrystal has good oxidation resistance. Only α-Al2O3 was formed on Al62.5Cu25Fe12.5 quasicrystal. The surface morphologies of AI-Cu-Fe quasicrystal after isothermal oxidation for different times were observed.
文摘An oxidation resistant Al-Cu-Fe quasicrystalline coating was fabricated on substrate of Ti alloy by low pressure plasma spraying (LPPS) method. As-sprayed Al-Cu-Fe coating has a rapidly solidified lamellar microstructure consisting of quasicrystalline phase and crystalline phase. The formation of quasicrystalline coating is related to the annealing. The results from the ox!dat!on experiments showed that Al-Cu-Fe quasicrystalline coating improved the oxidation resistance of Ti-base alloys. During the oxidation period there is no evident spallation of the coating from the substrate. Oxide formed on the surface of Al-Cu-Fe quasicrystalline coating after oxidation consisted of Al2O3. Oxidation occurs Ieading to a change of concentration and phase transformation in the coating surface. Selective oxidation of AI transforms the quasicrystalline phase into the phase.
文摘Microstructure and phase transformation in the Al-Cu-Fe alloys of the approximate compositional range of 20 - 50 at.% Cu and 2 - 10 Fe at.% have been investigated from samples quenched from their respective temperatures by means of different thermal analysis, magnetothermal analysis, scanning electron microscopy, electron probe analysis and powder X-ray diffraction. Representative phase transformations categorized as polymorphic, discontinuous precipitation, quasi-binary eutectoid, and ternary transitional U-type phase transformation are presented. These phase transformations were found to have a common feature which consumes the phase and appears the phase. A schematic diagram was proposed to demonstrate the transition processes with decreasing temperature.
文摘采用DMD-450真空镀膜仪将Al65Cu20Fe15准晶粉末沉积在Q235钢表面制备薄膜。研究了二氧化铈对薄膜的组织和结构的影响。采用透射电镜（TEM）、扫描电镜（SEM）、X射线衍射仪（XRD）等分析了薄膜的组织结构和表面形貌。利用纳米压痕仪（MTS）测试了薄膜的显微硬度和弹性模量。结果表明：通过准晶粉末真空蒸镀可以形成准晶薄膜。其组成相有CuAl2，A1Cu3 and I（Al65Cu20Fe15）相等。薄膜的成分取决于制备工艺。二氧化铈对薄膜的结构没有产生明显的影响。但是薄膜的显微硬度和弹性模量随二氧化铈添加量的增加而提高。当二氧化铈添加量为5％（质量分数）时，薄膜的显微硬度达到9．0GPa，弹性模量最高达到190GPa。此外，二氧化铈的添加明显增加了薄膜的耐蚀性能。
