Deformation behaviors and constructive relation of lotus-type porous copper under compressive direction perpendicular to pores

作者：Liu Xin Hua; Yao Di; Liu Xue Feng; Xie Jian Xin^*

来源：Chinese Journal of Nonferrous Metals, 2009, 19(7): 1237-1244.

• Compressive deformation
• Compressive deformations
• Constitutive relation
• Copper bar
• Deformation band
• Deformation behavior
• Deformation behaviors
• Deformation mechanism
• Effect factors
• Hydrogen pressures
• Lotus-type porous metal
• Mechanical model
• Plastic yield
• Porous metal
• Unidirectional solidification

The lotus-type porous copper bars with 45 mm in diameter and 120 mm in length were fabricated by unidirectional solidification at hydrogen pressure of 0.2 MPa and molten temperature of 1200°C. The compressive deformation process of the lotus-type porous copper with pore perpendicular to the compressive direction and its effect factors were investigated. The deformation mechanism of lotus-type porous copper with pores perpendicular to the compressive direction was also analyzed and discussed. The results show that the deformation of the lotus-typed porous copper consists of four stages of elastic deformation, plastic yield deformation, densification and plastic deformation after densification. The main deformation mechanism in the plastic yield stage is that several deformation bands generate sequentially under the perpendicular loading, and in these deformation bands the pores are deformed by flattening and collapsing sequentially. Based on the above results, the compressive mechanical model of the lotus-type porous metals with pores perpendicular to the compressive direction is established using the method of linear regression.

• 出版日期2009
• 单位北京科技大学