Essentials of Materials Science and Engineering, SI Edition
Essentials of Materials Science and Engineering, SI Edition
4th Edition
ISBN: 9781337672078
Author: ASKELAND, Donald R., WRIGHT, Wendelin J.
Publisher: Cengage Learning
Question
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Chapter 11, Problem 11.47P
Interpretation Introduction

(a)

Interpretation:

State that the copper element A or element B is labeled in given phase diagram of copper-silver metals.

  Essentials of Materials Science and Engineering, SI Edition, Chapter 11, Problem 11.47P

Fig. 1 - Phase diagram of copper-silver metals

Concept Introduction:

The properties of the copper-silver alloy are as follows-

1. Melting point − (779-900)°C

2. Molecular weight − 171.41

3. Density − (9.7-10.4)g/cm³

4. Insoluble in water

In the case of silver and copper alloy, both of these are not able to melt together and form a new alloy with (1-99)% of any one in pure form. That's why the alloy of this case, are mostly available in the following forms −

1. Sterling silver − In sterling silver, the weight percentage of pure silver is 92%

2. Coin silver - The weight percentage of pure silver available in coin silver is 90%

There is a new alloy also available known as Electrum. In this alloy, the weight percentage of silver is from (20 - 80)%.

Interpretation Introduction

(b)

Interpretation:

The well labelled phase diagram of the copper silver alloy needs to be sketched.

Concept Introduction:

The properties of the copper-silver alloy are as follows-

1. Melting point − (779-900)°C

2. Molecular weight − 171.41

3. Density − (9.7-10.4)g/cm³

4. Insoluble in water

In the case of silver and copper alloy, both of these are not able to melt together and form a new alloy with (1-99)% of any one in pure form. That's why the alloy of this case, are mostly available in the following forms −

1. Sterling silver − In sterling silver, the weight percentage of pure silver is 92%

2. Coin silver - The weight percentage of pure silver available in coin silver is 90%

There is a new alloy also available known as Electrum. In this alloy, the weight percentage of silver is from (20 - 80)%.

Interpretation Introduction

(c)

Interpretation:

Whether the new composition is stronger or weaker needs to be determined, if it cools down at 600 °C with 90 % A and 10 % B.

Concept Introduction:

The properties of the copper-silver alloy are as follows-

1. Melting point − (779-900)°C

2. Molecular weight − 171.41

3. Density − (9.7-10.4)g/cm³

4. Insoluble in water

In the case of silver and copper alloy, both of these are not able to melt together and form a new alloy with

  (1-99)% of any one in pure form. That's why the alloy of this case, are mostly available in the following forms −

1. Sterling silver − In sterling silver, the weight percentage of pure silver is 92%

2. Coin silver - The weight percentage of pure silver available in coin silver is 90%

There is a new alloy also available known as Electrum. In this alloy, the weight percentage of silver is from (20 - 80)%.

Interpretation Introduction

(d)

Interpretation:

The statement "microstructure can lead to the discrepancy" needs to be justified by giving an example.

Concept Introduction:

The properties of the copper-silver alloy are as follows-

1. Melting point − (779-900)°C

2. Molecular weight − 171.41

3. Density − (9.7-10.4)g/cm³

4. Insoluble in water

In the case of silver and copper alloy, both of these are not able to melt together and form a new alloy with (1-99)% of any one in pure form. That's why the alloy of this case, are mostly available in the following forms −

1. Sterling silver − In sterling silver, the weight percentage of pure silver is 92%

2. Coin silver - The weight percentage of pure silver available in coin silver is 90%

There is a new alloy also available known as Electrum. In this alloy, the weight percentage of silver is from (20 - 80)%.

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