A Rockwell hardness test is performed on a sample of aluminum. The result is rep

Question

A Rockwell hardness test is performed on a sample of aluminum. The result is reported as 54.0 HRF. What does "F" indicate? Type of indenter The ultimate tensile strength of the material The Brinell scope equivalence a. b. c. What is the stress at which deformation changes from "elastic" to "plastic" a. Yield stress b. Ultimate stress c. Fracture stress d. Plastic deformation on atomic level means atoms may a. b. c. React to form new matter Shift to a new molecule Slip on spatial configuration Which material property is best determined by a metal's "Modulus of Elasticity"? a. Hardness b. Strength c. Ductility

Explanation / Answer

1)

a) type of indenter

2)

a) yield stress

yield stress is point where elastic to plastic transformation takes place

3)

c) slip on spatial configuration

when plastic deformation takes place then atoms move from one position to another position

4)

c)ductility

ductility indicates deformation of material and modulus of elasticity indicates energy stored by material by deformation

5)

a) integral area below the stress strain curve as toughness it correlated to energy a material capable of absorbing when exposed to stress

6)

a)strength

if strenght is more then it can work with more speed so strenght is material property is selected for taking drill bits

7)

b) viscosity

it is fluid's property

8)

b)2.11 wt%

steels classified below 2.11 wt%

9)

a) ferrite + cementite

pearlite consists of ferrite and cementite

10)a)

alpha solid phase represents solid lead rich alloy phase

11)b)

beta solid phase represents solid tin rich alloy phase

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