摘要
为探讨非晶复合材料的弹性变形机制,采用铜模滴注法制备Cu_(43)Zr_(48)Al_4Nb_5非晶复合材料,室温下利用万能拉伸试验机进行单轴拉伸实验,并使用扫描电子显微镜观察断口形貌,同时采用数字散斑相关法从弹性应变场演化角度分析非晶复合材料拉伸变形过程。结果表明:拉伸变形过程中,拉伸应变逐渐增大,最大剪切应变起主导作用。在剪切应变场中出现压缩应变区,纵向应变场中出现应变集中条带,且条带中应变能密度和断裂能相差不大,导致材料未发生塑性变形。样品发生剪切断裂,断口表面呈现非晶特征的树枝状脉络条纹,出现塑坑结构和撕裂棱。该研究可为CuZrAlNb非晶复合材料拉伸变形与微观应变以及应变能传输的关系提供理论依据。
This paper is driven by the need for investigating the elastic deformation mechanism of amorphous composites.The investigation is done by preparing Cu43Zr48Al4Nb5 amorphous composites by copper die dropping method;performing uniaxial tensile tests at room temperature using universal testing machine;and observing the fracture morphologies by scanning electron microscopy, along with an analysis of the deformation process of amorphous composites from the perspective of elastic strain field using digital speckle correlation method.The results show that the tensile deformation process sees a gradual increase in tensile strain and the maximum shear strain plays a dominant role;the compressive strain zone appears in the shear strain field, and the strain concentrated band appears in the longitudinal strain field;the strain energy density and the fracture energy of the band are not quite different in quantity, and there is no plastic deformation;and the samples have shear fracture, whose surfaces exhibit amorphous venation patterns, dimple structure and tearing edges.The study could provide a theoretical basis for relationship between tensile deformation and microstrain, strain energy transfer of CuZrAlNb amorphous composite.
出处
《黑龙江科技大学学报》
CAS
2017年第5期449-452,共4页
Journal of Heilongjiang University of Science And Technology
基金
国家自然科学基金项目(51371078)
关键词
非晶复合材料
弹性变形
数字散斑
应变场
bulk metallic glass composite
elastic deformation
digital speckle
strain field
