A 200mm steel tensile stress sample experienced a strain 0.014 at a load of 457

Question

A 200mm steel tensile stress sample experienced a strain 0.014 at a load of 457 MPa. Application of additional load caused the sample to plastically deform. Just before fracture the sample strain was measured at 0.055 What was the length of the sample at fracture? What is the Young's modulus of the material? Is the material Ductile or Brittle? Explain your answer (Show all calculations) Looking at the Ni-Cu phase diagram on slides 12/13 from lecture 5 answer the following questions. What is the melting temperature of Nickel? What is the maximum Nickel concentration which is purely in the liquid phase at 1200C? Is the alloy in liquid, solid or mixed form at a composition of 20%Cu at 1300 degree C? For a 50% Ni alloy slowly cooled from 1400C, what is the composition of the solids at first solidification? Why? At 1300C, what is the % solids (Show all calculations)

Explanation / Answer

(1)

0.014 = delta L / 200mm

delta L = 2.8mm

Total L = 202.8mm
F = -k x
475MPa = -k * 0.0028m
k = 169,600 MPa/m

Young's modulus =stress/strain=32642.85 MPa

(2)

the alpha region is the only phase present; therefore, the composition at 1100 degrees Centigrade is a weight percent of sixty for Ni and forty for Cu

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