摘要
以Al、TiO_(2)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40kN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3h。烧结件承受10kN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TiO_(2)后,σz、σθ和σm增加,同时添加TiO_(2)和Gr降低了预制体的致密化和冷镦变形特性。
Aluminium-based metal matrix composites were synthesized from Al、TiO_(2) 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(σ_(z)),hoop stress(σ_(θ)),mean stress(σ_(m))and effective stress(σ_(eff))were calculated for all pre‐forms,which are related to the axial strain(ε_(z)).The densification behavior of the composites under axial strain(ε_z)and transverse strain was investigated.It is observed that the addition of 5% TiO_(2) into the Al matrix increasesσ_(z),σ_(θ),and σm.The addition of both TiO_(2) and Gr reinforce‐ments reduces the densification and deformation characteristics of the sintered preforms during cold upsetting.
作者
郑喜贵
吕刚磊
朱永刚
ZHENG Xigui;LU Ganglei;ZHU Yonggang(Zhengzhou Institute of Technology,School of Mechanical Engineering,Zhengzhou 450064,China;Henan Provincial Digital Intelligent Equipment Engineering Research Center,Zhengzhou 450064,China)
出处
《粉末冶金工业》
CAS
北大核心
2024年第3期67-74,共8页
Powder Metallurgy Industry
基金
河南省高等学校重点科研项目(24B460025)。
关键词
金属基复合材料
铝
冷镦
粉末冶金
加工性
metal matrix composite
aluminum
cold upsetting:powder metallurgy
workability
作者简介
郑喜贵(1976-),男,学士,副教授,主要研究方向为机械工程,铝基复合材料;通讯作者:吕刚磊(1983-),男,硕士,副教授,主要研究方向为机械工程,铝基复合材料。
