Anisotropic mechanical properties of porous copper fabricated by unidirectional solidification
Anisotropic mechanical properties of porous copper fabricated by unidirectional solidification
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DOI：
10.1016/s0921-5093(00)01402-7
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发表时间：
2001-02-15
期刊：
影响因子：
6.4
通讯作者：
Nakajima, H
中科院分区：
文献类型：
--
作者：
Hyun, SK;Murakami, K;Nakajima, H
在氢气和氩气的混合气体中，通过熔体的定向凝固制备了长圆柱形孔沿一个方向排列的多孔铜。孔隙率取决于铜熔体的熔化温度，而孔的取向则由凝固方向控制。研究了多孔铜单轴拉伸行为的各向异性。圆柱形孔平行于拉伸方向的多孔铜的极限抗拉强度和屈服强度随孔隙率的增加而线性下降。对于孔轴垂直于拉伸方向的多孔铜，在低孔隙率下，随着孔隙率的增加，其极限抗拉强度显著降低，而屈服强度在低孔隙率下达到最大值，然后随着孔隙率的增加而降低。这些结果解释在拉伸变形过程中在孔附近引起的应力集中。(C)2001 Elsevier Science B.V.保留所有权利。
Porous copper whose long cylindrical pores are aligned in one direction has been fabricated by unidirectional solidification of the melt in a mixture gas of hydrogen and argon. The porosity depends on the melting temperature of copper melt, while the orientation of the pores is controlled by the freezing direction. The anisotropy in the uniaxial tensile behavior of the porous copper is examined. The ultimate tensile strength and the yield strength of the porous copper with the cylindrical pores orientated parallel to the tensile direction decrease linearly with increasing the porosity. For the porous copper whose pore axes are perpendicular to the tensile direction, the ultimate tensile strength decreases significantly with increasing the porosity at low porosity, while the yield strength reaches a maximum at a low porosity and then decreases with increasing the porosity. These results are explained in terms of the stress concentration induced in the vicinity of the pores during tensile deformation. (C) 2001 Elsevier Science B.V. All rights reserved.