Reinforcing effect of laminate structure on the fracture toughness of Al3Ti intermetallic  

作　　者：Yang Cao Dan-dan Zhang Pei-jun Zhou Kun Liu Wu-yi Ming Jun Ma 

机构地区：[1]Mechanical and Electrical Engineering Institute,Zhengzhou University of Light Industry,Zhengzhou 450002,China [2]Key Laboratory of Superlight Materials&Surface Technology Ministry of Education,Harbin Engineering University,Harbin 150001,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第5期678-686,共9页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.11602230);the Program for Innovative Research Team in Science and Technology in University of Henan Province(No.18IRTSTHN015);the Key Scientific Projects of University in Henan Province(No.20B430021);the Young talent promotion project of Henan Province(No.2019HYTP002).

摘　　要：Metal/intermetallic laminate composites can improve the mechanical properties of intermetallic materials using metal layers. In recent years, titanium aluminide intermetallics have received increasing attention due to their excellent performance properties, such as high melting point, high specific strength and stiffness, and good corrosion resistance. However, the low fracture toughness of Al3Ti alloys at room temperature has greatly limited their application, and fiber or particle reinforcement has not shown a significant toughening effect. Research into the reinforcing effects of the interface and near-interface zone on the fracture behavior of Al3Ti is lacking. Ti/Al3Ti metal/intermetallic laminate composite was synthesized from titanium and aluminum foils using vacuum hot-pressed sintering technology. The microstructure of the prepared material was analyzed by scanning electron microscope and electron backscattered diffraction. Results illustrate that both Ti and Al3Ti were single-phase and there was a noticeable stress concentration on the interface. To obtain indentation and cracks, loads were applied to different locations of the composite by a microhardness tester. The growth path of the cracks was then observed under microscope, showing that crack propagation was prevented by the interface between the Ti and Al3Ti layers, and the cracks that propagated parallel to the laminate shifted to the interface. Fracture toughness of the different areas, including Al3Ti layers, interface, and near-interface zone, were measured by the indentation fracture method. The fracture toughness at and near the interface was 1.7 and 2 times that of the Al3Ti layers, respectively. Results indicate that crack blunting and crack front convolution by the laminate structure was primarily responsible for increased toughness.

关 键 词：interface titanium tri-aluminide INTERMETALLIC titanium/titanium tri-aluminide metal/intermetallic LAMINATE composite toughening effect indentation fracture method 

分 类 号：TB331[一般工业技术—材料科学与工程]