Al-Zr-O-B原位合成复合材料的微观组织和力学性能  

Microstructure and Mechanical Properties of In-situ Composites Prepared by the Direct Melt Reaction in the System of Al-Zr-O-B

作　　者：江润莲[1] 赵玉涛[1] 孙建祥[1] 

机构地区：[1]江苏大学

出　　处：《特种铸造及有色合金》2005年第5期316-318,共3页Special Casting & Nonferrous Alloys

基　　金：教育部重点基金资助项目 (2 0 0 0 156) ;江苏省教育厅自然科学基金资助项目 (0 1KJB430 0 0 3) ;江苏省"十五"科技攻关资助项目 (BE2 0 0 2 0 39)

摘　　要：采用Al Zr(CO3) 2 KBF4体系用熔体反应法成功合成了新型颗粒增强铝基复合材料。XRD和SEM分析表明,Zr(CO3) 2 和KBF4与铝液反应生成了ZrB2 、Al2 O3、Al3Zr颗粒,颗粒尺寸细小,且弥散分布于基体中,其平均尺寸约为80～90nm ;拉伸试验结果显示。Al Zr(CO3) 2 KBF4体系反应生成的复合材料的抗拉强度和屈服强度随着反应物加入量的增加均显著提高,复合材料的抗拉强度为1 5 0 .3MPa ,较铝基体的78.0MPa提高了92 .7% ;屈服强度为1 1 3.7MPa ,较铝基体的42 .0MPa提高了1 70 .7% ;复合材料的伸长率先升后降;由复合材料的拉伸断口SEM可知,随着反应物质量增加,塑性变形区减小,但仍然是塑性断裂。A new particulate reinforced Al matrix composites was successfully prepared by the direct melt reaction in system of Al-Zr(CO_3)_2-KBF_4.XRD and SEM analysis indicated that the formed fine ZrB_2,Al_2O_3 and Al_3Zr particulate with average grain size of 80～90 nm uniformly dispersed in the matrix.Tensile test showed that tensile strength,150.3 MPa,for 70.0 MPa of the Al matrix,raised by 92.7%,and yield strength,112.4 MPa,for the 42.0 MPa of the Al matrix,raised by 170.7%,of the composites remarkably increased with the increment of the reaction system addition.The elongation of the composites rises first and fall later.SEM observation reveals that although the ductile area is reduced with the increase of reaction system,the fracture mechanism is dominated.

关 键 词：Al—Zr-O-B体系 熔体反应法 铝基复合材料 微观组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]