Effect of grain boundary migration in Cu–Cr–Zr–Ti manufactured using different casting processes

Abstract

Grain boundary migration in different casting processes directly affects the grain size of the ingot, which affects the mechanical properties of the alloy. In this study, Cu–Cr–Zr–Ti rods are manufactured using upward continuous casting and casting-extrusion processes followed by drawing. It is found that the strength of the upward continuous casting rods is 621 MPa, greater than that of the casting-extrusion rods 571 MPa, which is a result of different microstructure evolution during solution treatment. Calculations of the driving force and resistance of grain boundary migration were performed to explain the observations.

Low cycle fatigue behavior of Cu‐Cr‐Zr alloy with different cold deformation

“…2,6,[8][9][10][11][12] Cu-Cr-Zr alloy used in contact wires are usually produced by semi-continuous casting and cold working. [13][14][15][16] Since cold deformation introduces dislocations, twinning and residual stress, which are considered to be important during preparation process for improving the strength of materials. 17 During the cold deformation process of the metal material, as the degree of deformation increases, the grain breaks and gets refined and a large number of dislocations are introduced.…”

“…Cu‐Cr‐Zr alloy used in contact wires are usually produced by semi‐continuous casting and cold working 13–16 . Since cold deformation introduces dislocations, twinning and residual stress, which are considered to be important during preparation process for improving the strength of materials 17 .…”

Solidification microstructure of Cu–Cr and Cu–Cr-In alloys

“…There are normally two ways to improve the alloy performance-optimization of heat treatment and addition of alloying elements [9][10][11][12]. For the Cu-Cr based alloys, common alloying elements include Zr [1,13,14], Ag [14][15][16], Mg [6,7,13], and Ti [17][18][19].…”