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- 2018
稀土氧化物(La2O3或CeO2)对搅拌摩擦加工制备Ni/Al复合材料组织和性能的影响
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Abstract:
采用搅拌摩擦加工（FSP）的方法制备Ni/Al复合材料，并在此基础上添加不同种类稀土氧化物（La2O3或CeO2），通过SEM、EDS、XRD、电子探针（EPMA）和室温拉伸试验研究稀土氧化物对FSP制备Ni/Al复合材料组织和性能的影响。结果表明：Ni/Al复合材料复合区有较明显的Ni粉团聚物存在，Ni-La2O3/Al、Ni-CeO2/Al复合材料中Ni粉团聚物数量减少，尺寸减小。La2O3和CeO2均对Al-Ni原位反应有较大影响，能够促进Al-Ni原位反应的进行，生成更多增强相。Ni-CeO2/Al复合材料与Ni-La2O3/Al复合材料相比，复合区组织更加均匀，增强颗粒Al3Ni含量更多。La2O3和CeO2均能显著提高FSP制备Ni/Al原位复合材料的抗拉强度。Ni-La2O3/Al复合材料的抗拉强度达到221 MPa，Ni-CeO2/Al复合材料的抗拉强度达到238 MPa，两者相比于Ni/Al的复合材料抗拉强度（166 MPa）分别提高了33.1%和43.4%。 The Ni/Al composites were fabricated by friction stir processing (FSP) by adding different kinds of rare earth oxides (La2O3 or CeO2). The effects of rare earth oxides on the microstructure and properties of Ni/Al composites were studied by SEM, EDS, XRD, electron probe microanalysis (EPMA) and tensile test at room temperature. The results show that Ni/Al composite has more obvious agglomerates of Ni in composite zone. The distribution of Ni power content and size increase in Ni-La2O3/Al and Ni-CeO2/Al composites. La2O3 or CeO2 can reinforce Al-Ni in-situ reaction to produce more reinforced phase. Ni-CeO2/Al composite has better uniform organization and the volume fraction of Al3Ni enhances in composite zone. The tensile strength of Ni/Al composite is significantly increased when adding La2O3 or CeO2. The tensile strength of Ni-La2O3/Al and Ni-CeO2/Al composites can reach 221 MPa and 238 MPa, respectively. Compared with the Ni/Al composites (166 MPa), the tensile strength has increased by 33.1% and 43.4%, respectively. 国家自然科学基金（51465044）；江西省自然科学基金（20171BAB206004）；江西省教育厅科技项目（GJJ160690）；轻合金加工科学与技术国防重点学科实验室开放基金（GF201601003）；南昌航空大学研究生创新专项资金（YC2016037）
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