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Indexed by:期刊论文

Date of Publication:2017-04-01

Journal:C e Ca

Included Journals:EI

Volume:42

Issue:4

Page Number:1338-1341

ISSN No.:00456152

Abstract:The dual-alloy joint made from diffusion bonding of   -TiAl alloy and TC11 titanium alloy is used to replace the traditional titanium alloy of single organization, and the joint can meet the operational performance requirements of aeroplane engines under high stress and thermal gradients. In addition to the base alloys, the overall properties of the dual-alloy joint are subject to the interface. Therefore, it's pretty meaningful to study the interfacial mechanical properties of the dual-alloy joint. Since the length of the interface is at micron scale, nanoindentation tests are carried out in this study. With the Oliver-Pharr method as the theoretical basis and   -TiAl alloy and TC11 titanium alloy as base alloys, we use Berkovich indenter to measure the nano-hardness and elastic modulus of the interfacial region, obtaining the change laws of interfacial mechanical properties: (1) nano-hardness and elastic modulus of the interface are 6.56 GPa and 158.33 GPa, respectively; (2) the hardness of the interface (  2-Ti3Al) is higher than that of   -TiAl alloy and TC11 titanium alloy in a descending order; (3) the elastic modulus of the interface (  2-Ti3Al) is between that of   -TiAl alloy and TC11 titanium alloy, and it decreases from   -TiAl alloy to TC11 titanium alloy. Itindicates the nanoindentation method is effective in characterizing the interfacial mechanical properties of diffusion bonding at micro-nano scale. ? 2017 Techna Group Srl & ESMC Co., Ltd.