机械合金化-放电等离子烧结Al<sub>2</sub>Cu颗粒增强Al基复合材料的制备

蒲少玲; 乔志佳; 牟洋; 薛丽红; 严有为; 吴树森

机械合金化-放电等离子烧结Al₂Cu颗粒增强Al基复合材料的制备

华中科技大学材料成形与模具技术国家重点实验室, 武汉 430074

基金项目: 国家重点基础研究发展计划(2012CB619600)

详细信息

通讯作者:
薛丽红,副教授,研究方向为金属基复合材料。E-mail:xuelh@mail.hust.edu.cn

中图分类号: TB331
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出版历程
- 收稿日期: 2013-08-12
- 修回日期: 2013-10-16
- 刊出日期: 2014-10-14

Preparation of Al₂Cu/Al composites by mechanical alloying and spark plasma sintering

State Key Laboratory of Material Processing and Die & Mold Technology, Huazhong University of Science and Technology, Wuhan 430074, China

摘要

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。
- 机械合金化 /
- 放电等离子烧结 /
- Al-Cu合金 /
- Al基复合材料 /
- 微观组织 /
- 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.
- mechanical alloying /
- spark plasma sintering /
- Al-Cu alloy /
- Al matrix composites /
- microstructure /
- mechanical property