MET 34800 - Engineering Materials Chapter 19

MET 34800 - Engineering Materials Chapter 19 - MET 34800...

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Unformatted text preview: MET 34800 ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department CHAPTER 19 ALUMINUM AND ITS ALLOYS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski Upon completion of this chapter, the student should: have an understanding of aluminum alloy systems and alloy designations have a working knowledge of heat treatment and coating of aluminum have guidelines for alloy selection CHAPTER GOALS Students need to leave this chapter with a repertoire of alloys to fit their perceived needs and a working knowledge of aluminum designations, heat treatments, coatings, and properties. 3 Historical development Aluminum ore (bauxite) Conversion with the Hall Cell Ingot to mill products INTRODUCTION 4 Figure 191 Cell reduction of aluminum oxide to aluminum INTRODUCTION 5 Electrical conductivity Density Non-toxic Relatively low E Fabricability Corrosion resistance 19.1 GENERAL CHARACTERISTICS 6 Figure 192 Density of aluminum compared to other metals 19.1 GENERAL CHARACTERISTICS 7 The following are some of the noteworthy advantages of using aluminum. 19.1 GENERAL CHARACTERISTICS 1. One-third the weight of steel 2. Good thermal and electrical conductivity 3. High strength-to-weight ratio 4. Can be given a hard surface by anodizing and hard coating 5. Most alloys are weldable 6. Will not rust 7. High reflectivity 8. Can be die cast 9. Easily machined 10. Good formability 11. Nonmagnetic 12. Nontoxic 13. One-third the stiffness of steel 8 Designations include heat treat, and manufacturing, 6XXX-T6, etc. Cast alloys Aluminum products 19.2 ALLOY DESIGNATION 9 The most commonly used alloy designation system in the United States is that of the Aluminum Association. For wrought alloys, it is based on four digits corresponding to the principal alloying elements: 19.2 ALLOY DESIGNATION Commercially pure aluminum 1000 (99% min.) Copper (major alloying element) 2000 Manganese 3000 Silicon 4000 Magnesium 5000 Magnesium and silicon 6000 Zinc 7000 Other elements 8000 Unused series 9000 10 Table 191 Temper designations 19.2 ALLOY DESIGNATION 11 The second digit in this system designates mill control or lack of same on specific elements. The last two digits have no significance, except that in the 1xxx series they coincide with aluminum content above 99% in hundredths. A 1040 alloy has 99.4% aluminum. The complete specification of wrought aluminum alloys involves a suffix that indicates the degree of cold work or thermal treatments....
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MET 34800 - Engineering Materials Chapter 19 - MET 34800...

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