应变速率对Zr_(67.76)Cu_(11.94)Ni_(8.30)Al_(12)非晶复合材料力学性能及锯齿流变行为的影响  

Effects of Strain Rates on Mechanical Properties and Serrated Flow Behaviors of Zr_(67.76)Cu_(11.94)Ni_(8.30)Al_(12) Metallic Glass Composite

作　　者：姚佩[1] 寇生中[1,2] 李春燕[1,2] 赵燕春[1,2] 袁小鹏[1] 蒲永亮[1] 谢启慧 高记鹏 

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》2016年第9期2337-2341,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);甘肃省青年科技基金计划(1107RJYA275);甘肃省科技计划(145RJZA090)

摘　　要：采用统计学方法研究了应变速率对Zr_(67.76)Cu_(11.94)Ni_(8.30)Al_(12)非晶复合材料力学性能及锯齿流变行为的影响。结果表明:随着应变速率的增加,材料的塑性应变减小,抗压强度下降;同时应力降幅Δσ的锯齿分布从单调下降分布转变为峰状分布,应力降幅的频数由小应力降幅区间向大应力降幅区间过渡,单位塑性应变的锯齿频数M呈下降趋势,试棒侧面剪切带数量减少且相互交割、分支、阻止作用明显减弱,此时,由多重剪切带扩展转变为单一剪切带扩展,使得材料的力学性能迅速下降。The influences of strain rates on mechanical properties and serrated flow behaviors of Zr67.76Cu11.94Ni8.30Al12 metallic glass composite have been investigated with statistical methods. The results demonstrate that both the plastic strain and the compressive strength decrease with the increasing of strain rates. Meanwhile, the serrated distribution of stress drop（Δσ） changes from monotonically decreasing into a peak-like shape, and the absolute frequency transits from a small interval to a large one. The serrated number of unit plastic strain（M） continuously declines. Moreover, the number of the shear bands decreases and the interaction among them significantly weakens. In the meantime, the extension transforms from multiple shear bands to a single shear band, resulting in the rapid decline in mechanical properties of the composite.

关 键 词：应变速率 非晶复合材料 力学性能 锯齿流变 

分 类 号：TB33[一般工业技术—材料科学与工程]