Ni-Al金属间化合物基层板复合材料的组织和力学性能  

Microstructure and mechanical properties of Ni-Al intermetallic-based laminate composites

作　　者：薛帅兵 林飞[1] 孟令健 黄钟森 林鹏[1] XUE Shuai-bing;LIN Fei;MENG Ling-jian;HUAHG Zhong-sen;LIN Peng(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《塑性工程学报》2021年第12期177-183,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51505323)。

摘　　要：研究了铝箔厚度对反应合成层板复合材料组织和拉伸性能的影响。使用70μm厚的纯镍箔材和厚度分别为20、50、80和100μm的纯铝箔材,在真空条件下通过热压反应合成了Ni-Al金属间化合物基层板复合材料。使用光学显微镜、X射线衍射仪和扫描电镜研究了层板复合材料的显微组织并测试了其力学性能。结果表明,通过调控Ni和Al的含量可以得到具有不同微观组织及力学性能的层板复合材料。随着Al含量的减少,显微组织由单一NiAl相向Ni+Ni;Al+NiAl混合相转变。铝箔厚度为20μm的复合材料室温拉伸性能较好,抗拉强度和伸长率分别达到了642 MPa和15.6%。在1000℃时,铝箔厚度为80μm的复合材料具有高塑性,伸长率达到101.3%,而铝箔厚度为50μm的复合材料则具有高强度,抗拉强度达到140.2 MPa,且随着铝箔厚度的降低,拉伸断裂方式由塑性断裂向准解理断裂转变。The effects of aluminum foil thickness on the microstructures and tensile properties of reaction-synthesized laminate composites were studied. The Ni-Al intermetallic-based laminate composites were synthesized by hot-pressing reaction in vacuum atmosphere using pure nickel foil with thickness of 70 μm and pure aluminum foil with thickness of 20, 50, 80 and 100 μm. The microstructures of the laminate composites were studied using optical microscope(OM),X-ray diffractometer(XRD) and scanning electron microscope(SEM) and the mechanical properties were tested. The results show that the laminate composites with different microstructures and mechanical properties can be obtained by adjusting the contents of Ni and Al. With the decrease of Al content, the microstructure changes from single NiAl phase to Ni+Ni;Al+NiAl mixed phases. The tensile properties at room temperature of composite are better when the thickness of aluminum foil is 20 μm, and the tensile strength and elongation reach 642 MPa and 15.6%, respectively. At 1000 ℃, the composite with the alnuminum foil thickness of 80 μm has high plasticity, and the elongation reaches 101.3%. While the composite with the aluminum foil thickness of 50 μm has high strength, and the tensile strength reaches 140.2 MPa. With the decrease of aluminum foil thickness, the tensile fracture mode changes from plastic fracture to quasi-cleavage fracture.

关 键 词：Ni-Al金属间化合物 复合材料 微观组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]