新型多孔金属纤维/粉末烧结复合板材拉伸性能的实验研究

Experimental Study on Tensile Properties of a Novel Porous Metal Fiber/Powder Sintered Composite Sheet.

作者信息

Zou Shuiping, Wan Zhenping, Lu Longsheng, Tang Yong

机构信息

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.

出版信息

Materials (Basel). 2016 Aug 23;9(9):712. doi: 10.3390/ma9090712.

DOI:10.3390/ma9090712

PMID:28773833

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5457085/

Abstract

A novel porous metal fiber/powder sintered composite sheet (PMFPSCS) is developed by sintering a mixture of a porous metal fiber sintered sheet (PMFSS) and copper powders with particles of a spherical shape. The characteristics of the PMFPSCS including its microstructure, sintering density and porosity are investigated. A uniaxial tensile test is carried out to study the tensile behaviors of the PMFPSCS. The deformation and failure mechanisms of the PMFSCS are discussed. Experimental results show that the PMFPSCS successively experiences an elastic stage, hardening stage, and fracture stage under tension. The tensile strength of the PMFPSCS is determined by a reticulated skeleton of fibers and reinforcement of copper powders. With the porosity of the PMFSS increasing, the tensile strength of the PMFPSCS decreases, whereas the reinforcement of copper powders increases. At the elastic stage, the structural elastic deformation is dominant, and at the hardening stage, the plastic deformation is composed of the structural deformation and the copper fibers' plastic deformation. The fracture of the PMFPSCS is mainly caused by the breaking of sintering joints.

摘要

通过烧结多孔金属纤维烧结板（PMFSS）和球形铜粉的混合物，开发出一种新型多孔金属纤维/粉末烧结复合板（PMFPSCS）。研究了PMFPSCS的微观结构、烧结密度和孔隙率等特性。进行了单轴拉伸试验以研究PMFPSCS的拉伸行为。讨论了PMFSCS的变形和破坏机制。实验结果表明，PMFPSCS在拉伸过程中依次经历弹性阶段、强化阶段和断裂阶段。PMFPSCS的拉伸强度由纤维的网状骨架和铜粉的增强作用决定。随着PMFSS孔隙率的增加，PMFPSCS的拉伸强度降低，而铜粉的增强作用增加。在弹性阶段，结构弹性变形占主导，在强化阶段，塑性变形由结构变形和铜纤维的塑性变形组成。PMFPSCS的断裂主要是由烧结接头的断裂引起的。