Design Technology - Topic 4.2a

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13 Terms

1

Metals

Crystalline structures made up of grains

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Large/Coarse Grains

Formed through slow cooling. Increases tensile strength, toughness, ductility, and malleability

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3

Small Grains

Formed through fast cooling. Decreases tensile strength, toughness, and ductility. Increases brittleness

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4

Alloys

The mixture of a metal with another material.

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5

Alloying

Process of combing a metal with another material. Increases hardness and strength, but decreases malleability and ductility

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6

Work Hardening

Process of increasing the hardness of a metal through applying a process when the metal is cold

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7

Tempering

Application of heat after work hardening. Reduces some of the hardness and stiffness, but it increases the toughness and ductility of the metal

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8

Super Alloys

Metal alloys that exhibit high degrees of mechanical strength, resistance to corrosion, and surface stability

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9

Creep

Slow expansion or deformation of a material over time. Can be exaggerated by high temperatures or prolonged force

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10

Oxidation

The reaction of metal with oxygen

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11

Ferrous Alloys

Alloys containing iron, making them magnetic. Mild steel, stainless steel, and cast iron

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12

Non-ferrous alloys

Alloys that do not contain iron. Aluminum, copper, silver, tin, and zinc

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13

Galvanizing

Protective coatings that protect against corrosion

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