摘要
采用内氧化工艺制备了Al2O3弥散强化Cu-Al2O3/(Ce+Y)复合材料,分析了其显微组织,并对冷轧变形的复合材料的微观组织和性能进行了分析。结果表明:Cu-Al-(Ce+Y)合金薄板内氧化后固溶的Al脱溶与[O]形成Al2O3,TEM分析表明,大量细小均匀的γ-Al2O3相弥散分布在铜基体上,粒径约为5～20 nm,粒子间距为10～50 nm,并且沿晶面(440)和晶向[11 2]析出;Cu-Al2O3/(Ce+Y)复合材料经60%变形后,Al2O3呈链状分布,与Cu晶粒被拉长方向一致,形成明显的纤维组织;Cu-Al2O3/(Ce+Y)复合材料的显微硬度和抗拉强度随变形量的增大逐渐增加,当变形量为80%时,显微硬度值约为内氧化后原始试样显微硬度的1.4倍,抗拉强度比原始试样的抗拉强度增加了165 MPa,而导电率下降约4%IACS。
Cu-Al2O3 /RE composite was prepared by internal oxidation.Microstructure and properties of the composites with and without deformation by means of TEM,SEM,conductivity measurement,microhardness and tensile tests.The results indicate that after intrenal oxidation of the Cu-Al-RE alloy sheet,Al precipitated from solid solution reacts with [O]to form Al2 O3.A great deal of small γ-Al2 O3 particles with size of approximately is 5 ～ 20 nm and granule spacing of 10 ～ 50 nm separate out along crystal plane（440） and lattice orientation [ 11 2 ]and disperse in Cu matrix.After 60% deformation for Cu-Al2O3 /（Ce ＋ Y） composite,Al2O3 chained distribution is elongated along Cu grain direction,forming the obvious fiber structure.The microhardness and the tensile strength of Cu-Al2 O3 /（Ce ＋ Y） composite increase with increasing amount of deformation.When the amount of deformation is 80%,the microhardness value of the composite is 1.4 times of that of the original sample after internal oxidation,and the tensile strength increases 169 MPa compared with that of original sample,but the electrical conductivity decreases 4% IACS.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第10期5-9,共5页
Transactions of Materials and Heat Treatment
基金
河南省杰出青年科学基金(0512002700)
河南省高校创新人才培养工程(豫高教2005-126)
