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Questions and Answers
Which category do materials that contain iron belong to?
Which category do materials that contain iron belong to?
What is the primary characteristic of non-ferrous metals?
What is the primary characteristic of non-ferrous metals?
Which of the following materials is a thermoplastic polymer?
Which of the following materials is a thermoplastic polymer?
Which ferrous metal has a carbon content greater than 2%?
Which ferrous metal has a carbon content greater than 2%?
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What is one of the common uses of copper?
What is one of the common uses of copper?
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What distinguishes aluminum as a non-ferrous metal?
What distinguishes aluminum as a non-ferrous metal?
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Which of the following is NOT a type of engineering material classification mentioned?
Which of the following is NOT a type of engineering material classification mentioned?
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What is a commonly known alloy derived from copper?
What is a commonly known alloy derived from copper?
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What is the primary characteristic of a thermoplastic?
What is the primary characteristic of a thermoplastic?
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Which materials are categorized as ceramics?
Which materials are categorized as ceramics?
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Which composite characteristic highlights its advantages over individual materials?
Which composite characteristic highlights its advantages over individual materials?
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What defines a unit cell in crystalline structure?
What defines a unit cell in crystalline structure?
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Which of the following materials is considered to have low mechanical strength?
Which of the following materials is considered to have low mechanical strength?
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Among the following, which metallic crystal structure is known as body-centered cubic?
Among the following, which metallic crystal structure is known as body-centered cubic?
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Which property is typically excellent in ceramics?
Which property is typically excellent in ceramics?
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What type of material features low density and medium to high mechanical strength?
What type of material features low density and medium to high mechanical strength?
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Study Notes
Manufacturing Technology - Lecture 2: Engineering Materials
-
Material Components of a Car:
- Ferrous metals make up 65% of a car's materials.
- Plastics make up 10%.
- Aluminum makes up 6%.
- Other materials (textiles, fluids, electrical components, and glass) each represent smaller percentages.
Classification of Engineering Materials
- Materials are categorized into four main groups:
- Metals
- Polymers
- Ceramics
- Composites
Metals
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Ferrous Metals:
- Contain iron (Fe).
- Examples include steels, stainless steels, and cast irons.
- Wrought iron (pure iron) has a melting temperature of 1539°C.
-
Non-Ferrous Metals:
- Do not contain iron (Fe).
- Examples include gold, silver, aluminum, copper, and titanium.
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Types of Steel:
- Plain carbon steel: iron carbon alloy with less than 2% carbon.
- Alloy steel: some elements are added to improve its properties (e.g., nickel-chromium steel, or stainless steel).
- Cast iron: iron carbon alloy with more than 2% carbon, and a relatively low melting temperature.
-
Aluminum:
- Melting temperature of 658°C.
- Good rust resistance.
- Light in weight.
- Used in kitchenware and other manufacturing applications.
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Copper:
- Melting temperature of 1083°C.
- Used in cables.
- Copper + Zinc = Brass
- Copper + Tin = Bronze
Polymers
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Thermoplastics:
- Can be molded or reshaped above a specific temperature.
- Return to solid state upon cooling, and can be repeatedly molded.
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Thermosets:
- Do not become moldable once they cool down.
- Irreversible cure, often through heat or chemical reaction.
Ceramics
- Compounds of metallic and non-metallic elements.
- Examples include glass, diamond, oxides, nitrides, and carbides.
Composites
- Combinations of two or more chemically distinct materials.
- Their physical properties are superior to their individual components.
- High strength-to-weight ratio.
Crystal Structure of Materials
- Crystalline structure: The arrangement of atoms in a crystal.
- Unit cell: The smallest repeating group of atoms in a crystal structure, showing its characteristics.
Metallic Crystal Structures (Unit Cell)
- Body-Centered Cubic (BCC): Examples include chromium, iron, molybdenum, and tungsten.
- Face-Centered Cubic (FCC): Examples include aluminum, copper, gold, lead, and nickel.
- Hexagonal Closed Pack (HCP): Examples include magnesium, titanium, and zinc.
Material Selection
-
Factors affecting material selection:
- Function of the material
- Shape of the object
- Manufacturing processes
- Material Properties: Density, mechanical strength, high temperature stability.
- Relationship between Function, Shape, Process and Material -These factors are interconnected and cannot be separated. Shape, function, and process all impact material selection, and reciprocally, the material selection influences the other factors.
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Description
Explore the materials that comprise automotive engineering in this quiz focused on Manufacturing Technology. Learn about the classification of engineering materials, including metals and polymers, and discover the percentages of materials used in car manufacturing.
