作　　者： ; ; ; ; ; ;

机构地区： 哈尔滨工业大学

出　　处： 《稀有金属材料与工程》 2007年第7期1153-1156,共4页

摘　　要： 采用电弧熔炼铜模铸造法制备了Ta晶体相增强的Zr基非晶合金复合材料。利用差示扫描量热仪(DSC),X射线衍(XRD)射仪,扫描电子显微镜(SEM)等手段研究了Ta加入对(Zr0.65Cu0.175Ni0.175)90-xTaxAl10(x=0,4,6,8,10)(原子百分比)非晶复合材料非晶形成能力及力学性能的影响。结果表明,Ta的加入改变了合金的晶化行为,随着Ta含量的增加,合金的DSC曲线由单一晶化峰转变为多个晶化峰。加入10%Ta的块体非晶合金复合材料的基体固溶约4%的Ta。复合材料的塑性应变量达到3.2%,同时最大应力达到1855MPa,明显高于不含Ta合金。块状非晶合金复合材料中Ta晶体相的存在,阻止单一剪切带的扩展,诱发更多剪切带形成,从而提高了材料的抗压强度和塑性。 Zr-based bulk amorphous alloy （BAA） matrix composites with Ta crystalline phase as reinforcement were prepared by arc-melting copper mold casting method. The effect of Ta element adding on the glass-forming ability and the mechanical properties of （Zr0.65Cu0.175Ni0.175）90-xTax Al10 （x=0, 4, 6, 8, 10） （at%） alloys were investigated mainly by means of differential scanning calorimeter （DSC）, X-ray diffraction （XRD） and scanning electric microscopy （SEM）. It was shown that the Ta element adding into alloy matrix changed the crystallization behaviors of continuous heating for the alloys. For （Zr0.6sNi0.175Cu0.175）80Ta10Al10 alloy composite, the solubility limit of Ta in the amorphous phases is approximately 4%. The maximum stress and plastic strain of the composite containing 10% Ta are as high as 1 855 MPa and 3.2%, respectively, both higher than those of the Ta-free BAA. The Ta crystalline particles prevent the catastrophic propagation of the single shear band, favorable for the formation of multiple shear bands, and significantly increasing the plastic strain and yield strength under an uniaxial compression, compared to the Ta-free alloy.

关 键 词： 块体非晶合金 复合材料 力学性能 剪切带

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]