Chapter 15 Introduction to Nonferrous Metals 349 11. True or False? Cast molds for nonferrous metals can be made of steel because melting and processing temperatures are lower for most nonferrous metals than for steel. 12. True or False? Hot isostatic pressing (HIP) can close and heal pores in a metal part formed during casting at atmospheric pressure. 13. Some alloys develop significant segregation during casting and may suffer _____ during reheating for heat treatment. A. liquation B. partial cooling C. solidification D. oxidation 14. If a copper alloy is joined to another alloy by fusion arc welding, what must the other alloy be made of? A. Aluminum B. Copper C. Magnesium D. Tin Apply and Analyze 1. How is tin (Sn) able to be hot-worked at room temperature? 2. What happens in the microstructure of a nonferrous metal while “warm-working” during bulk deformation? 3. How can a nonferrous alloy be strengthened to resist creep? 4. Explain how overaging an alloy can be beneficial to a metal part. 5. In a pair of metal pieces in contact, what happens to the less electronegative metal piece if the more electronegative piece is exposed to a corrosive environment? 6. Name three ways to protect nonferrous metals from corrosion. Critical Thinking 1. The chapter discussed many processing methods for nonferrous metals. Think of a metal part and argue which processing methods are best suited to processing that part. 2. Based on the chapter, what are the main differences between ferrous and nonferrous metals? 2. All metals form regions called _____, with atoms neatly aligned in unit cells. A. grains B. precipitates C. dislocations D. stresses 3. _____ are compounds that separate from a solution upon cooling through a phase change. A. Fresh crystal grains B. Precipitates C. Tangled crystal grains D. Unit cells 4. True or False? Metals with face-centered cubic (fcc) atom structures have more slip planes than body-centered (bcc) metals. 5. True or False? Hot-worked metal tends to be tougher, but less ductile, than cast ingots. 6. For most nonferrous metals, the stress-strain curve smoothly changes from _____ to _____. A. the elastic region, the plastic region B. the plastic region, the elastic region C. high yield strength, low yield strength D. low yield strength, high yield strength 7. Cold work such as cold-rolling or cold forging increases the alloy’s strength and _____. A. ductility B. hardness C. recrystallization D. elongation 8. According to the Cu-Be phase diagram (Figure 15-11), at what position is the metal considered to be solutionized? A. Position A B. Position B C. Position C D. Position D 9. The second step in precipitation hardening of a nonferrous alloy is _____. A. solutionizing B. allowing coherent precipitates to form C. artificial aging D. water quenching to form “pre-precipitate” regions 10. Higher temperatures allow shorter aging time and hence faster production when using _____. A. coherent precipitates B. natural aging C. artificial aging D. oil quenching Copyright Goodheart-Willcox Co., Inc.
Metallurgy Fundamentals, 6th Edition Page 349 (367 of 528)
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Chapter 15 Introduction to Nonferrous Metals 349 11. True or False? Cast molds for nonferrous metals can be made of steel because melting and processing temperatures are lower for most nonferrous metals than for steel. 12. True or False? Hot isostatic pressing (HIP) can close and heal pores in a metal part formed during casting at atmospheric pressure. 13. Some alloys develop significant segregation during casting and may suffer _____ during reheating for heat treatment. A. liquation B. partial cooling C. solidification D. oxidation 14. If a copper alloy is joined to another alloy by fusion arc welding, what must the other alloy be made of? A. Aluminum B. Copper C. Magnesium D. Tin Apply and Analyze 1. How is tin (Sn) able to be hot-worked at room temperature? 2. What happens in the microstructure of a nonferrous metal while “warm-working” during bulk deformation? 3. How can a nonferrous alloy be strengthened to resist creep? 4. Explain how overaging an alloy can be beneficial to a metal part. 5. In a pair of metal pieces in contact, what happens to the less electronegative metal piece if the more electronegative piece is exposed to a corrosive environment? 6. Name three ways to protect nonferrous metals from corrosion. Critical Thinking 1. The chapter discussed many processing methods for nonferrous metals. Think of a metal part and argue which processing methods are best suited to processing that part. 2. Based on the chapter, what are the main differences between ferrous and nonferrous metals? 2. All metals form regions called _____, with atoms neatly aligned in unit cells. A. grains B. precipitates C. dislocations D. stresses 3. _____ are compounds that separate from a solution upon cooling through a phase change. A. Fresh crystal grains B. Precipitates C. Tangled crystal grains D. Unit cells 4. True or False? Metals with face-centered cubic (fcc) atom structures have more slip planes than body-centered (bcc) metals. 5. True or False? Hot-worked metal tends to be tougher, but less ductile, than cast ingots. 6. For most nonferrous metals, the stress-strain curve smoothly changes from _____ to _____. A. the elastic region, the plastic region B. the plastic region, the elastic region C. high yield strength, low yield strength D. low yield strength, high yield strength 7. Cold work such as cold-rolling or cold forging increases the alloy’s strength and _____. A. ductility B. hardness C. recrystallization D. elongation 8. According to the Cu-Be phase diagram (Figure 15-11), at what position is the metal considered to be solutionized? A. Position A B. Position B C. Position C D. Position D 9. The second step in precipitation hardening of a nonferrous alloy is _____. A. solutionizing B. allowing coherent precipitates to form C. artificial aging D. water quenching to form “pre-precipitate” regions 10. Higher temperatures allow shorter aging time and hence faster production when using _____. A. coherent precipitates B. natural aging C. artificial aging D. oil quenching Copyright Goodheart-Willcox Co., Inc.
