粉末热机械固结法对块体铜显微组织和力学性能的影响

Effects of Powder Thermomechanical Consolidation Method on Microstructure and Mechanical Properties of Bulk Copper

纯铜粉末经放电等离子烧结,得到了固结良好的块体铜材料,再对放电等离子烧结后的试样进行热挤压。测量了屈服强度、伸长率。结果表明:热挤压后样品的显微结构和力学性能都发生显著变化;在热挤压过程中,晶粒发生动态再结晶,生成尺寸较小的晶粒。挤压棒的屈服强度提高至74MPa;同时挤压过程使得颗粒界面处的弱结合点减少,伸长率上升至47.6%。

A well-consolidated bulk Cu sample was fabricated by spark plasma sintering (SPS) of copper powder,then the hot extrusion of the sample was carried out.The yield strength and elongation of the sample was measured.The results show that the microstructure and mechanical properties of the samples after hot extrusion change obviously.During hot extrusion,the dynamic recrystallization takes place in grain the fine grain forms.The yield strength of the extruded rod increases to 74 MPa.Meanwhile,the hot extrusion process decreases the weak bonding points at the particle interface,and the elongation increases to 47.6%.