Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Abstract

Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

高速铁路传动技术

“…In addition to high-speed wheel-rail systems, magnetic levitation (maglev) is also a hot topic in highspeed rail research (Al-Qadi et al, 2010;Arivazhagan et al, 2015;Anbazhagan et al, 2016;Atapek et al, 2020). Sun et al (2023) proposed a fault-tolerant control strategy that improves the tolerance of the suspension system of high-speed maglev trains to actuator faults.…”

SiC Takviyeli Cu-Al-Ni Kompozitlerinin Üretiminde Toz Metalurjisi Yönteminin Kullanımı ve Üretim Sonucunun Karakterizasyonu

“…CuAlNi and its alloys are preferred mainly in biomedical, automotive and aerospace fields due to their excellent corrosion and heat resistance, strength and toughness (Kim et al, 2020;Lei et al, 2019;Wang et al, 2018). In addition, there are many areas of use in machinery equipment, construction materials, industrial applications such as medical and electronic devices and in many areas that ease daily life such as telephone antennas (Atapek, Pantelakis, Polat, Chamos, & Çelik, 2020;Wu et al, 2013). Despite its wide usage area, problems may occur in industrial applications of CuAlNi and its alloys in terms of their mechanical properties and content (Dash, Sohn, Vaßen, Guillon, & Gonzalez-Julian, 2019).…”

High-cycle and very-high-cycle fatigue behavior of a stainless steel for air-conditioning compressor valve plates

“…, 2019; Mossaab et al. , 2019; Atapek et al. , 2020), it still lacks some related study about the comparison of High-Cycle Fatigue (HCF) and Very-High-Cycle Fatigue (VHCF) of the material for valve plates.…”