Chapter 14, Problem 14.2P

Strength of metals and their alloys increases as grain size decreases. Find out the amount of increase in strength if total area of grain boundaries doubles

The number of copper-nickel alloys with a mention of the applications of each of them

Which of the following statements are true of dislocations: Select one or more: a. Dislocations are spatially fixed defects b. Dislocations enable plasticity in metals Dislocations can be viewed without the aid of a microscope Dislocations can arise due to shear deformation of the lattice □ c. d. e. Dislocations arise due to insertion of a foreign atom into a lattice site of a "host" metal

According to Hall-Petch equation, the 1 point decreasing in grain size causes strengthening of metals * True False

Determine the percentage of ductility of a metal alloy having the following tensile stress-strain diagram.

The engineering yield strength of an alloy is 80 ksi.

Q3: Analyze the following figure and answer the following question (Fe-C Diagram) ? 1639 Liquid 1400 +y 7+L L-Fec 1146 C Fe.C- 910 7- Fesc 727 C o.025 a- Fesc 6.67 of Hypo ectd- Hyper ectd 0810 Steel Cast Iron I- What are the % solubility and temperature of exist of a-ferrite? b- 0.025% and 273°c to 910 c. d- 0.05% and 910°c to 1124°c. a-0.05% and 273°c to 910°c. c- 2.1% and 910°c to 1394°c. 2- What are the % solubility and temperature of exist of Austenite (Y)? a- 0.05% and 273°c to 910°c. c- 2.1% and 910°c to 1394°c. b- 0.025% and 273°c to 910°c. d- 0.09% and 1394°c to 1539°c. 3- What are the % solubility and temperature of exist of 8-ferrite? a- 0.05% and 273°c to 910°c. b-0.025% and 273 e to 910°e. c- 2.1% and 910°c to 1394°c. d- 0.09% and 1394°c to 1539°c. 4- What is the % C content in Cementite Fe3C? AB a- 6.67%. b- 0.025%. c- 2.1%. d- 0.09%. (aradu

Use the following Phase Diagram for a Ge-Si alloy for the following questions: Ge - Si Alloy Phase Diagram 1500 1400 Liquid 1300 1200 Liquid 1100 1000 900 20 40 60 80 100 Composition (wt% Si) Temperature (°C)

A copper-zine alloy has the properties shown in the table below. Grain Diameter (mm) Strength (MPa) 0.015 170 MPa 0.025 158 MPa 0.035 151 MPa 0.050 145 MPa Determine (a) the constants in the Hall-Petch equa- tion; and (b) the grain size required to obtain a strength of 200 MPa.