Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第5期    总第146期    2011年5月

[PDF全文下载]        

    

文章编号:1004-0609(2011)05-1045-07
规则多孔铜的拉伸性能及其各向异性
彭 震, 杨天武, 李再久, 黎振华, 金青林, 周 荣
 
(

(昆明理工大学 材料科学与工程学院,昆明 650093)

摘 要: 采用固−气共晶定向凝固的方法制备规则多孔铜,研究其室温拉伸性能的各向异性和气孔率对拉伸力学性能的影响,建立表征抗拉强度与气孔率和拉伸方向相关的数学模型。结果表明:规则多孔铜的拉伸性能主要取决于材料的气孔率和拉伸方向;随着气孔率的增大,规则多孔铜的拉伸性能明显下降;规则多孔铜拉伸性能呈各向异性特征,0°方向性能最好,45°方向的次之,90°方向的最差;各拉伸方向的实验数据与模型数据吻合良好。断口分析表明:规则多孔铜呈韧性断裂,拉伸断裂从孔壁处开始,最终因颈缩导致完全断裂。

 

关键字: 规则多孔铜;各向异性;力学性能;气孔率;应力集中

Tensile properties and anisotropy of ordered porous copper
PENG Zhen, YANG Tian-wu, LI Zai-jiu, LI Zhen-hua, JIN Qing-lin, ZHOU Rong

School of Materials Science and Engineering,
Kunming University of Science and Technology, Kunming 650093, China

Abstract:The ordered porous copper with cylindrical pores aligned in one direction was fabricated by the solid-gas eutectic solidification process. The anisotropy of tensile properties and the porosity of ordered porous copper at room temperature were investigated. In order to discuss the effects of porosity and tensile direction on ultimate tensile strength, the stress concentration models were established. The results show that the tensile properties of ordered porous copper depend on the porosity and tensile direction. As the porosity increases, the tensile properties decrease dramatically. The anisotropy of porous copper shows that the tensile properties of ordered porous copper with 0°, 45° and 90° tensile directions are the best, better and the worst, respectively. The experimental data are well consistent with the data from the model. Through fractographic analysis, it is indicated that the ductile fracture begins at the inside walls of pores, and the eventual rupture is due to necking during the tensile process.

 

Key words: ordered porous copper; anisotropy; mechanical properties; porosity; stress concentration

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com