铝基混杂粉末冶金复合材料的制备及成形行为
Synthesis and forming behavior of aluminum-based hybrid powder metallurgic composites
郑喜贵 1吕刚磊 1朱永刚1
作者信息
- 1. 郑州科技学院机械工程学院,河南郑州 450064;河南省数字化智能装备工程研究中心,河南郑州 450064
- 折叠
摘要
以Al、TiO2和Gr粉末为原料,采用粉末冶金技术制备铝基金属基复合材料,并研究其冷镦成形特性.在40 kN液压机上,采用适当的冲头和模具对粉末预制件进行压制,在590 ℃的电炉中空气气氛下烧结3 h.烧结件承受10 kN的增量压缩载荷进行冷镦,直到在自由表面发现裂纹为止.计算预制件的轴向应力(σz)、环向应力(σθ)、平均应力(σm)和有效应力(σeff),这些应力均与轴向应变(εz)有关.研究了复合材料在轴向应变(εz)和横向应变下的致密化行为.结果表明,添加5％的TiO2后,σz、σθ和σm增加,同时添加TiO2和Gr降低了预制体的致密化和冷镦变形特性.
Abstract
Aluminium-based metal matrix composites were synthesized from Al、TiO2 and Gr powder mixtures using the powder metallurgy technique and their forming characteristics were studied during cold upsetting.The powder preforms were pressed with a 40 kN hydraulic press with appropriate punches and dies,and then sintered in an electric furnace at 590 ℃ for 3 h in an air atmosphere.The sintered preforms were subjected to incremental compressive loads of 10 kN until cracks were found on the free surface.Axial stress(σz),hoop stress(σθ),mean stress(σm)and effective stress(σeff)were calculated for all pre-forms,which are related to the axial strain(εz).The densification behavior of the composites under axial strain(εz)and transverse strain was investigated.It is observed that the addition of 5％TiO2 into the Al matrix increases σz,σθ,and σm.The addition of both TiO2 and Gr reinforce-ments reduces the densification and deformation characteristics of the sintered preforms during cold upsetting.
关键词
金属基复合材料/铝/冷镦/粉末冶金/加工性Key words
metal matrix composite/aluminum/cold upsetting/powder metallurgy/workability引用本文复制引用
基金项目
河南省高等学校重点科研项目(24B460025)
出版年
2024
NETL
NSTL
万方数据