Metals
Bayani Gaba-gaba
Metals give us the strongest, most enduring everyday objects: the steel in a car body, the aluminium in a drinks can, the copper in the wiring behind your wall. What makes metals special is a combination of strength, ductility and the ability to conduct heat and electricity, plus a property that polymers and timbers lack - the structure of a metal can be changed by force or heat to make it harder, tougher or softer to suit the job.
This note covers the 0445 Materials-option metals objectives: classifying metals and their stock forms, properties, environmental impact and uses; the ferrous metals and alloys (cast iron, mild steel, stainless steel, high-speed steel and the carbon steels); the non-ferrous metals and alloys (aluminium, copper, lead, tin, zinc, brass, duralumin, pewter); and how work hardening and heat treatments change the molecular structure to alter properties.
Manufura
- demonstrate knowledge of metals and understand their classification, stock forms, properties, environmental impact and uses
- demonstrate knowledge of ferrous metals and alloys, for example: - cast iron - mild steel - stainless steel - high-speed steel (HSS) and carbon steels
- demonstrate knowledge of non-ferrous metals and alloys, for example: - aluminium - copper - lead - tin - zinc - brass - duralumin - pewter
- understand how work hardening and heat treatments can affect the properties of metals by changing the molecular structure.
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Nazarin Darasi
Barka da kammala darasi akan Metals. Yanzu da kuka bincika mahimman ra'ayoyi da ra'ayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
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- Which of the following is a ferrous metal? A. Copper B. Aluminium C. Mild steel D. Brass Answer: C
- Brass is an alloy of which two metals? A. Iron and carbon B. Copper and zinc C. Aluminium and copper D. Tin and lead Answer: B
- Which property makes high-speed steel (HSS) suitable for drill bits and cutting tools? A. It is the cheapest steel available B. It is non-magnetic C. It keeps its hardness even at high cutting temperatures D. It cannot rust under any conditions Answer: C
- What is the effect of work hardening on a metal? A. It softens the metal and makes it more ductile B. It makes the metal harder and stronger but more brittle C. It melts the metal D. It has no effect on properties Answer: B
- Why is high-carbon steel tempered after it has been hardened? A. To make it even harder B. To remove some brittleness and increase toughness C. To make it rust-resistant D. To increase its carbon content Answer: B
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