Preparation of Al2Cu/Al composites by mechanical alloying and spark plasma sintering
-
摘要: 以Al粉和Cu粉为原料,采用机械合金化(MA)和放电等离子烧结(SPS)工艺,原位合成了致密的Al2Cu/Al块体复合材料,着重研究了MA过程中粉末的形貌、尺寸和物相结构的变化以及SPS后复合材料的微观组织和力学性能。结果表明: 在MA过程中,随着MA时间延长,部分Cu原子逐渐固溶于Al原子晶格中,形成均匀过饱和的固溶体Al(Cu);在SPS过程中,Cu从过饱和固溶体中析出并与Al反应形成Al2Cu颗粒,且弥散分布于Al基体中,形成Al2Cu/Al复合材料;Al2Cu/Al复合材料的致密度高达98.7%,室温下的压缩断裂强度为611.3 MPa,延伸率为9.6%,具有良好的力学性能。Abstract: The bulk dense Al2Cu/Al composites were prepared in situ by mechanical alloying (MA) and spark plasma sintering (SPS), using Al and Cu powders as raw materials.The variation of morphology, size and phase structure of powders during the MA process was studied.The microstructure and the mechanical properties of composites after SPS process were investigated.The results show that with the increase of MA time in MA process, some amount of Cu atoms gradually diffuse into Al atomic lattice to form a homogeneous supersaturated Al (Cu) solid solution.During SPS process, Cu atoms precipitate from supersaturated solid solution and then react with Al to form Al2Cu particles uniformly distributed in Al matrix and Al2Cu/Al composites are formed.The density of Al2Cu/Al composites reaches up 98.7%.It exhibits good mechanical properties with high fracture strength (611.3 MPa) and large plastic strain (9.6%) at room temperature.
-
点击查看大图
计量
- 文章访问数: 605
- PDF下载量: 457
- 被引次数: 0
下载:
