INFLUENCE OF HEAT TREATMENT AND DEFORMATION ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES Cu-Ni-Sn ALLOY

• Main Author: Nguyen Duong Nam
• Format: Article
• Language: English
• Published: Zibeline International 2019-05-01
• Series: Journal of Mechanical Engineering Research and Developments
• Subjects: spinodal decomposition; bronze alloy; microstructure; heat treatment process; deformation
• Online Access: https://jmerd.org.my/Paper/Vol.42,No.3(2019)/102-105.pdf

This article present about studying on effect heat treatment and strain on mechanical properties of Cu-7Ni-7Sn alloy. This alloy is high elasticity alloy, advance characteristics of this alloy can obtain when associate heat treatment and deformation. The article ejected advance heat treatment and deformation behavior for its. Before processing hardness, strength, the elastic limit of this alloy have a small value. The hardness obtains about 90 – 95HB; the strength obtains about 200MPa; the elastic limit obtain about 100MPa.After heat treatment and deformation, hardness, strength, elastic limit of alloy ascend to multiple; the hardness obtains 294 – 302HB; the strength obtains 1000MPa; the elastic limit obtains 600 – 700MPa. This fact could explain by two mechanisms: deformation mechanism and spinodal transition. Deformation mechanism is to pull small grain lichen, increasing the strength of this alloy. Spinodal decomposition is a mechanism by which a solution of two or more components can separate into distinct regions (or phases) with distinctly different chemical compositions and physical properties. This mechanism differs from classical nucleation in that phase separation due to spinodal decomposition is much more subtle, and occurs uniformly throughout the material not just at discrete nucleation sites. The fineness of spinodal structures is characterized by the distance between regions of identical composition, which is of the order of 50 to 1000 Ao.