梯度多孔Mg-Ca合金的力学性能研究  

Study on mechanical properties of gradient porous Mg-Ca alloy

作　　者：李强[1,2] 张峰峰[1] 于景媛[1] 周旭[1] 孙旭东[2] 

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《功能材料》2013年第14期2032-2035,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA060102);长江学者和创新团队计划资助项目(IRT0713);辽宁省自然科学基金资助项目(201102090);辽宁省博士启动基金资助项目(20111068);辽宁省高等学校杰出青年学者成长计划资助项目(LJQ2012056)

摘　　要：主要研究了具有不同孔隙梯度分布的多孔Mg-Ca合金在横向和纵向压缩时孔洞的受力以及变形特征,分析了梯度多孔Mg-Ca合金在弯曲时裂纹扩展机理,并观察了孔隙梯度结构和烧结温度对梯度多孔Mg-Ca合金力学性能的影响。研究结果表明,梯度多孔Mg-Ca合金的力学性能优于均匀多孔材料,随着试样边缘和中心孔隙度差距的增加,试样的抗弯强度、抗压强度和弹性模量均增加,纵向压缩时样品抗压强度和弹性模量的增加优于横向压缩,这主要归因于孔隙的梯度分布导致受力时外加载荷的重新分配。随着烧结温度增加,梯度多孔Mg-Ca合金的力学性能增加,在620℃烧结2h时力学性能达到最佳。In this paper suffered load modes and deformation characteristics of pores were studied at landscape and portrait orientation compression for porous Mg-Ca alloys with different gradient pore distribution.Expansion mechanism of bending crack of gradient porous Mg-Ca alloys was analyzed.Effects of pore gradient structure and sintering temperature on mechanical properties were observed.The results show the mechanical properties of gradient porous Mg-Ca alloys are prior to those of uniform porous samples.With the increase of pore gradient distribution,the bending strength,compressive strength,Young＇s modulus all increase.The improvement of compressive strength and Young＇s modulus after portrait orientation compression are higher than those after landscape orientation compression because the gradient distribution of pores can result in anew assignment of additional loads.With the increasing of sintering temperature,the mechanical properties of gradient porous Mg-Ca alloys increase.When sinter at 620℃ for 2h,the mechanical properties of gradient porous Mg-Ca alloys come to the maximum.

关 键 词：多孔Mg-Ca合金 梯度孔隙 压缩性能 弯曲性能 

分 类 号：TQ146[化学工程]