MEASUREMENT OF THE VARIATION OF MECHANICAL PROPERTIES WITH AGING TEMPERATURES FOR SAND CAST Cu-5Ni-5Sn ALLOY

Abstract

The purpose of the investigation is to study the mechanical properties of copper-nickel-tin spinodal alloy and its effect with respect to aging temperatures using sand casting process without cold work. An alloy of Cu-5Ni-5Sn was melted in a crucible furnace under argon atmosphere and cast into sand moulds. Homogenized and solution treated specimens were aged at 300 °C, 350 °C, and 400 °C for different period of time. Specimens were tested for its mechanical properties such as micro-hardness, yield stress, tensile stress and percent elongation. It was found that the peak hardness increases with aging temperatures up to 400 °C. Yield and tensile stresses are proportional to hardness of the alloy. Percent elongation decreases with increase in hardness and stresses. Incremental yield stress increases with increase in aging temperature of the alloy. Also, the yield stress of the alloy is found to increase two times than that of traditional cast bronze alloys.

Keywords

• Cu-Ni-Sn alloy
• Modulated structure
• Ordered structure
• Hardness
• Heat treatment
• Sand casting