Abstract
In this paper, the static and fatigue properties of a Cu-Ni-Sn alloy are investigated. Tensile tests, hardness tests and microstructural analyses using optical and scanning electron microscopy (SEM) were performed and two sets of fatigue tests, with load ratio (R) R = − 1 and R = 0 , respectively, were carried out. The results showed the capability of the alloy to bear high static stress, thanks to its good strength properties. However, the fatigue tests showed a strong sensitivity of the alloy fatigue properties depending on the raw material batch. The comparison between microstructural analyses and fatigue test results showed a strong correlation; in particular, the specimens having a more inhomogeneous microstructure showed lower durability. In addition, the different microstructure also affected the fracture surface morphology as highlighted by SEM analyses.
Highlights
The use of Ni-Cu-Sn spinodal alloys gained interest for some industrial applications in recent years [1].Such alloy was originally developed and used in the industry in the 1970s by Bell Laboratiories [2] but did not spread due to technological issues in the manufacturing process [3,4]
Due to its finer granular microstructure, the hardness of the specimen extracted from Bar A resulted in 20–40 HV higher values than the hardness obtained on the specimen extracted from Bar B
As it can be observed Bar B specimens exhibited a significantly lower fatigue endurance than specimens extracted from Bar A and this, again, can be ascribed to the different microstructure
Summary
The use of Ni-Cu-Sn spinodal alloys gained interest for some industrial applications in recent years [1].Such alloy was originally developed and used in the industry in the 1970s by Bell Laboratiories [2] but did not spread due to technological issues in the manufacturing process [3,4]. The use of Ni-Cu-Sn spinodal alloys gained interest for some industrial applications in recent years [1]. System) C72900 is considered; such alloy is typically used for bushings and bearings in corrosion resistant and heavy applications [5,6,7], where high strength and excellent wear behavior are generally required. This alloy is obtained through casting followed by a heat treatment
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