包覆轧制过共晶高硅铝合金材料的性能研究  

Study of Properties on Clad-rolling Hypereutectic High-silicon Aluminum Alloy Material

作　　者：杨伏良[1] 甘卫平[1] 陈招科[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《材料导报》2004年第10期94-96,共3页Materials Reports

基　　金：国防科学技术工业委员会资助项目MKPT-03-151

摘　　要：针对应用广泛的过共晶高硅铝合金,采用熔炼铸造与包覆轧制相结合的方法,制备了Si含量>26%的高硅铝合金材料,通过电子金相显微镜和扫描电镜时合金材料的微观组织进行了分析,并对材料进行了热膨胀系数、气密性及抗拉强度的测定。实验结果表明:包覆轧制可有效阻止脆性材料裂纹的扩展;在100～400℃,Si含量为28.49%的高硅铝合金材料在纵向的热膨胀系数的平均值为16.3×10^(-6),横向为16.2×10^(-6),气密性为0.9966×10^(-7),材料纵向的室温抗拉强度为135.610MPa;Si含量为32.08%的材料,在100～400℃,纵向的热膨胀系数的平均值为15.9×10^(-6),横向为15.8×10^(-6),气密性为3.4×10^(-7),材料纵向的室温抗拉强度为93.96MPa。Seeing that hypereutectic high-silicon aluminum alloy is a widely used material, high-silicon aluminum alloy with Si content bigger than 26% is prepared by way of integrating melting casting and clad-rolling. Analysis of microstructure of alloy material was conducted using metallic phase microscope and SEM, and thermal expansion coefficient, hemeticity and tensile strength were measured. Experimental results show that clad-rolling can effectively prevent the spread of crack of brittle material. At 100～400°C, for high-silicon aluminum alloy with Si content of 28. 49%, the average value of thermal expansion coefficient in horizontal direction is 16. 2×10^(-6)and that in vertical 16. 3×10^(-6). Then hermeticity is 0. 9966×10^(-7)and tensile strength 135. 610MPa at room temperature. For material with Si content of 32. 08%and at 100～400°C, average value of thermal expansion coefficient in vertical direction is 15. 9×10^(-6) and that in horizontal direction 15. 8×10^(-6). Then hermeticity is 3. 4×10^(-7) and tensile strength at room temperature is 93. 96MPa.

关 键 词：过共晶 轧制 高硅铝合金 铸造 金相显微镜 微观组织 熔炼 包覆 性能研究 热膨胀系数 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146[金属学及工艺—金属材料]