You need to produce a Ci-Ni alloy having minimum yield strength of 20,000psi, a minimum tensile strength of 60,000 psi, and a minimum % elongation of 20%. What is the best possible composition for the Cu-Ni based on these specifications.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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**Objective:**  
To produce a Cu-Ni alloy with:
- Minimum yield strength of 20,000 psi
- Minimum tensile strength of 60,000 psi
- Minimum elongation of 20%

**Graph Explanation:**

The graph plots the mechanical properties of Cu-Ni alloys against the weight percent of nickel (Ni) ranging from 0% (pure copper) to 100% (pure nickel). The x-axis represents the weight percent of nickel, while the y-axis has two separate scales: strength (psi) on the left and percent elongation on the right.

**Curves:**

1. **Yield Strength Curve:**  
   - Starts at around 10,000 psi for 0% Ni and increases gradually with more nickel content.

2. **Tensile Strength Curve:** 
   - Begins at approximately 40,000 psi for 0% Ni, rises steeply, peaking around 70,000 psi near 50% Ni, then declines slightly with more nickel.

3. **% Elongation Curve:**  
   - Starts high at about 60% elongation for 0% Ni, decreases sharply, reaches a minimum near 40% Ni, and then increases again.

**Optimal Composition:**

To achieve the specified requirements for yield strength, tensile strength, and % elongation, the optimal composition is around 30-40% Ni. This range balances the higher tensile strength and acceptable yield strength while maintaining a good percentage of elongation.
Transcribed Image Text:**Objective:** To produce a Cu-Ni alloy with: - Minimum yield strength of 20,000 psi - Minimum tensile strength of 60,000 psi - Minimum elongation of 20% **Graph Explanation:** The graph plots the mechanical properties of Cu-Ni alloys against the weight percent of nickel (Ni) ranging from 0% (pure copper) to 100% (pure nickel). The x-axis represents the weight percent of nickel, while the y-axis has two separate scales: strength (psi) on the left and percent elongation on the right. **Curves:** 1. **Yield Strength Curve:** - Starts at around 10,000 psi for 0% Ni and increases gradually with more nickel content. 2. **Tensile Strength Curve:** - Begins at approximately 40,000 psi for 0% Ni, rises steeply, peaking around 70,000 psi near 50% Ni, then declines slightly with more nickel. 3. **% Elongation Curve:** - Starts high at about 60% elongation for 0% Ni, decreases sharply, reaches a minimum near 40% Ni, and then increases again. **Optimal Composition:** To achieve the specified requirements for yield strength, tensile strength, and % elongation, the optimal composition is around 30-40% Ni. This range balances the higher tensile strength and acceptable yield strength while maintaining a good percentage of elongation.
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