Cu_(50-x)Zr_(40+x)Al_5Nb_5合金非晶形成能力、组织结构及力学性能研究  

Glass Forming Ability, Microstructure and Mechanical Properties of Cu_(50-x) Zr_(40+x) Al_5Nb_5 Alloys

作　　者：赵燕春[1,2] 寇生中[1,2] 袁小鹏[1,2] 李春燕[1,2] 蒲永亮[1] 徐娇[1] 于朋[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《稀有金属材料与工程》2015年第2期381-385,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50961008;51061008);"973"计划前期研究专项(2011CB612203);高等学校博士学科点专项科研基金资助课题(20116201120003);甘肃省青年科技基金计划(1107RJYA275);浙江省自然科学基金(LQ13E010002)

摘　　要：选择Cu50-x Zr40+x Al5Nb5(x=0,2,4,6)合金,研究主要元素成分变化对非晶形成能力和组织的影响,分析了组织结构和力学性能的关系。结果表明,玻璃形成最优成分为Cu46Zr44Al5Nb5,ΔTx、Trg、γ参数分别为51.9 K,0.60,0.401,具有良好的热稳定性。全非晶结构的Cu46Zr44Al5Nb5合金其断裂强度高达1811 MPa,无明显宏观塑性变形;断口表面较平整,且伴有明显的脉络状花样大面积的分布在断面上,扩展方向一致。非晶-晶体复合结构的Cu44Zr46Al5Nb5合金具有较好综合力学性能,其断裂强度达到1747 MPa,塑性应变为3.94%;断口平滑区分布着大面积细密且深的脉络状花样,剪切带宽度约为40μm,与压缩轴向约成45°。Cu44Zr46Al5Nb5合金析出结晶相的尺寸小于剪切带的宽度,且分布均匀,外力加载时对非晶基体起到一定的增韧作用。结晶相的组织结构和尺寸分布决定了非晶-晶体复合材料的力学行为。The effects of composition changes of major elements on glass forming ability and microstructure in Cu50-x Zr40＋x Al5Nb5（x=0, 2,4, 6） alloy system were investigated. And the relationship between microstructure and mechanical properties were studied. The results show that Cu46Zr44Al5Nb5 with good thermal stability and best glass forming ability in the alloy system, whose ΔTx, Trg and γ are up to 51.9K, 0.60 and 0.401, respectively. The fracture strength of Cu46Zr44Al5Nb5 amorphous alloy is up to 1811 MPa with no obvious macro-plastic deformation. And the fracture surface is comparatively smooth, with the vein-like patterns widely distributed in the same extend direction.The Cu44Zr46Al5Nb5 alloy with an amorphous and crystalline composite structure exhibits good comprehensive mechanical properties including the fracture strength of 1747 MPa and plastic strain of 3.94%. And its vein-like patterns on fracture surface are closer and deeper.The shear bands width is about 40 μm with the axial compressive direction about 45°. The crystalline phase of Cu44Zr46Al5Nb5 alloy is well-distributed, the size of which is smaller than the shear band width, toughening the glass matrix as loading. The microstructure, size and distribution of the crystalline phase determine the mechanical behavior of the composites.

关 键 词：块体金属玻璃 非晶形成能力 组织 力学性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]