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14)After the abovementioned process, the alloy was reheated to 700 ºC and held for 105s. The final microstructure is 15)A hypothetical eutectic phase diagram for metals A and B is shown on the right. The approximate composition range for precipitation hardening of A-B alloys is
AMME 2302/5302 – Materials 1. Semester 1 2014 Supplementary ExaminationPaper 5-8 16)Ceramics are brittle because: 17)Glass has the following characteristics: 18)For a ceramic compound, the following characteristic/s of the component ions determine the crystal structure: 19)Polymers have: 20)Which of the following statements is true?
AMME 2302/5302 – Materials 1. Semester 1 2014 Supplementary ExaminationPaper 6-8 Question 2 (10 Marks)(1) (5 marks) Part of the Cu-Ni equilibrium phase diagram is shown below. Prove that the weight fractions of the liquid phase and the solid phase at temperature TBcan be expressed by: LLLLLLCCCCSRRWCCCCSRSMMMW00andPlease do not directly apply the lever rule to this question. (2) (5 Marks) The following figure is the Ru-Zr binary phase diagram. Determine the phase transformations at points 1, 2, 3, and 4 and specify the phases in areas A and B.
AMME 2302/5302 – Materials 1. Semester 1 2014 Supplementary ExaminationPaper 7-8 Question 3 (10 Marks)A brass alloy is known to have a yield strength of 275 MPa, a tensile strength of 380 MPa, and an elastic modulus of 103 GPa.