Question

Extension Questions 8. Listed below are the components of several common alloys used in industry today. Use a refer- ence table of atomic radii to determine if the alloy is likely to be interstitial or substitutional based on what you learned from Model 1 Type of Alloy Structure Alloy Atomic Radii Components Copper, Zinc Brass Copper, Tin Bronze Iron, Carbon Steel Lead, Antimony, Bismuth, Silver Pewter Iron, Carbon, Chromium Stainless Steel 9. There are three types of steel; mild steel, medium steel and high carbon steel. Use the Internet to research the uses and properties of steel. What causes the differences in properties among the three types?

Answer 1

Any o Brass Components Cu, Zn Atomic radii cu 128pm Zn → 134pm Type of alloy 3 Substitutional alloy Substitutional alloy are formed by substituting one metal atom yor another metal atom of smaller sitze. Interstitial alloys are formed by inserting smalley atoms into holes of the metal lattice. I Bronze Component → Cu, Sn Atomic radii → Cu 128pm 1 sn → 140pm Type of alloy Interstitial alloy Smaller atom such as carbon fit in between the larger atoms o in the crystal packing.

3 Steel langer U spaces between - Components Fe, C Atonuc nadi – Fe -->126 pm C -- 77pm Type of alloy - Interstitial Small carbon atoms fill spaces Fe atoms ņ pewter Components → Pb, sb, Br, Ag Atomic radii - Pb - 146 pm sby 140pm - Bit 150pm Ag 144 pm Type of alloy + Substitutional Stainless steel Component - Fe, C, er Atomic radii → Fe → 126pm с — 1 ри Cr → 128 pm Alloy type → Substitutional and interstitial both Carbon atom fit between the moon atoms, but Cr atom replace. Some fe atoms. 15

Ang qa) Mild Steel properties + Soft and malleable steel Uses - for making sheet metal, tin plates, motor body etc. b) Medium Steel Properties Oses → Very soft and ductile steel making springs, tyres , rails, Stamping and pressing dies. 9. tigh - Properties - Uses → Carbon steel - Very hand and brittle making hammers, drills, knives, and stone mason's tool. chisels It ů the carbon content which makes the difference between mild, medium and high carbon steel. ☺ Low carbon steel whas carbon content between 0.05% and 0.30 / : & high carbon steel has 0.55 of and 0.95%. ® Medium Carbon Stech has 0:31-41 to 0.60.).