Al2O3p/Al composite coatings were prepared on the surface of AZ31 magnesium alloy by plasma spraying technology with mixed powders of Al and Al2O3. An orthogonal test containing six factors and five levels was carried...Al2O3p/Al composite coatings were prepared on the surface of AZ31 magnesium alloy by plasma spraying technology with mixed powders of Al and Al2O3. An orthogonal test containing six factors and five levels was carried out to acquire the optimum technical parameters. Mierostruetures and properties of the composite coatings were studied. The results show that the coatings consist of Al2O3 particulates distributed uniformly and Al matrix, and the interface between the particulate and matrix is continuous, compact and clean. With increasing the mass fraction of Al2O3 in the mixed powders, the volume fraction of Al2O3 in the coatings iacreases. The Al2O3p/Al composite coating with 14% Al2O3 volume fraction has more compact microstrueture and more satisfactory properties.展开更多
采用原位反应近液相线铸造方法制备Al2O3P/Al-Cu复合材料,对其进行二次加热,研究晶粒的形貌演变和长大规律。用光学显微镜观察组织结构,应用Image Pro Plus软件测量并统计出平均晶粒尺寸及合金液相体积分数,并与理论计算数值进行比较。...采用原位反应近液相线铸造方法制备Al2O3P/Al-Cu复合材料,对其进行二次加热,研究晶粒的形貌演变和长大规律。用光学显微镜观察组织结构,应用Image Pro Plus软件测量并统计出平均晶粒尺寸及合金液相体积分数,并与理论计算数值进行比较。结果表明,在590℃保温10～60 min后,不含Al2O3颗粒的Al-6.8%Cu基体合金平均晶粒尺寸为89～132μm,液相体积分数为14%～26.8%,而3.6 wt%Al2O3P/Al-6.8%Cu复合材料的平均晶粒尺寸为73-107μm,液相体积分数为11.6%～20.9%。说明Al2O3颗粒在合金的二次加热过程中对晶粒长大行为及液相体积分数的增长均有明显的抑制作用,从而为优化半固态组织提供了一种新思路。展开更多
Al2O3p-Al composites were synthesized using an in-situ reaction in the 80%Al-20%CuO （mass fraction） system. The effects of the CuO particle size on the synthesis temperature and microstructure of the composites were...Al2O3p-Al composites were synthesized using an in-situ reaction in the 80%Al-20%CuO （mass fraction） system. The effects of the CuO particle size on the synthesis temperature and microstructure of the composites were investigated by various methods. The results indicate that the CuO particle size has a significant effect on the temperature at which the complete reaction in the Al-CuO system occurs：the temperature is 200 ℃ lower in the Al-CuO system containing CuO particles with sizes less than 6μm than that containing CuO particles with sizes less than 100μm. The interfacial bonding between Al2O3 particles and Al is not complete when the temperature is below a critical value. The morphology of the Al2O3 particles varies from ribbon-like shape to near spherical shape when the temperature is above a critical value. These two critical temperatures are affected by the particle size of CuO, and the critical temperature of the sample containing CuO particles with sizes less than 6μm is 100 ℃ lower than that of the sample containing CuO particles with sizes less than 100μm.展开更多
将Ce添加在Al2O3p/Al复合材料中,采用Axiovert25CA金相显微镜和QUANTA400扫描电镜,研究了Ce含量对Al2O3p/Al复合材料铸态组织的影响。结果表明,Ce的加入可以促进Al2O3颗粒的分散、细化α-Al晶粒、使Al Fe Si由粗大骨骼状变为断续的块状...将Ce添加在Al2O3p/Al复合材料中,采用Axiovert25CA金相显微镜和QUANTA400扫描电镜,研究了Ce含量对Al2O3p/Al复合材料铸态组织的影响。结果表明,Ce的加入可以促进Al2O3颗粒的分散、细化α-Al晶粒、使Al Fe Si由粗大骨骼状变为断续的块状或球状,可以提高复合材料的强度。展开更多
基金This research was supported by Jilin Province Science Foundation （No. 20090552）.
文摘Al2O3p/Al composite coatings were prepared on the surface of AZ31 magnesium alloy by plasma spraying technology with mixed powders of Al and Al2O3. An orthogonal test containing six factors and five levels was carried out to acquire the optimum technical parameters. Mierostruetures and properties of the composite coatings were studied. The results show that the coatings consist of Al2O3 particulates distributed uniformly and Al matrix, and the interface between the particulate and matrix is continuous, compact and clean. With increasing the mass fraction of Al2O3 in the mixed powders, the volume fraction of Al2O3 in the coatings iacreases. The Al2O3p/Al composite coating with 14% Al2O3 volume fraction has more compact microstrueture and more satisfactory properties.
文摘采用原位反应近液相线铸造方法制备Al2O3P/Al-Cu复合材料,对其进行二次加热,研究晶粒的形貌演变和长大规律。用光学显微镜观察组织结构,应用Image Pro Plus软件测量并统计出平均晶粒尺寸及合金液相体积分数,并与理论计算数值进行比较。结果表明,在590℃保温10～60 min后,不含Al2O3颗粒的Al-6.8%Cu基体合金平均晶粒尺寸为89～132μm,液相体积分数为14%～26.8%,而3.6 wt%Al2O3P/Al-6.8%Cu复合材料的平均晶粒尺寸为73-107μm,液相体积分数为11.6%～20.9%。说明Al2O3颗粒在合金的二次加热过程中对晶粒长大行为及液相体积分数的增长均有明显的抑制作用,从而为优化半固态组织提供了一种新思路。
基金Project(2012MS0801)supported by the Natural Science Foundation of Inner Mongolia,China
文摘Al2O3p-Al composites were synthesized using an in-situ reaction in the 80%Al-20%CuO （mass fraction） system. The effects of the CuO particle size on the synthesis temperature and microstructure of the composites were investigated by various methods. The results indicate that the CuO particle size has a significant effect on the temperature at which the complete reaction in the Al-CuO system occurs：the temperature is 200 ℃ lower in the Al-CuO system containing CuO particles with sizes less than 6μm than that containing CuO particles with sizes less than 100μm. The interfacial bonding between Al2O3 particles and Al is not complete when the temperature is below a critical value. The morphology of the Al2O3 particles varies from ribbon-like shape to near spherical shape when the temperature is above a critical value. These two critical temperatures are affected by the particle size of CuO, and the critical temperature of the sample containing CuO particles with sizes less than 6μm is 100 ℃ lower than that of the sample containing CuO particles with sizes less than 100μm.
文摘将Ce添加在Al2O3p/Al复合材料中,采用Axiovert25CA金相显微镜和QUANTA400扫描电镜,研究了Ce含量对Al2O3p/Al复合材料铸态组织的影响。结果表明,Ce的加入可以促进Al2O3颗粒的分散、细化α-Al晶粒、使Al Fe Si由粗大骨骼状变为断续的块状或球状,可以提高复合材料的强度。
