Please explain as in depth as you can, I truly want to understand. Problem 5 For
ID: 1712195 • Letter: P
Question
Please explain as in depth as you can, I truly want to understand. Problem 5 For each of the following statements, indicate whether the statement is true or false. Justify (explain) your answer in each case. (1) The Burgers vector of an edge dislocation is normal to the dislocation line and normal to the slip plane. (i) If material A has a higher stiffness than material B, material A must also have a higher proportional limit than material B. (i) Self-interstitials do not form in pure metals. (iv) Stacking faults in HCP crystals change the structure locally to BCc (v) When materials are subjected to a tensile strain, the lateral strain is always negative. (vi) High bond energies are associated with high melting temperatures.Explanation / Answer
vi true
The melting point of a material is one of the characteristics of its bond strength (bond energy). In many cases, higher bond energy reflects higher melting point.
for proper understanding take example
v TREU
To compenset the volume of deformed body
because volume of body before deformatiomn will be equal to after deformation
if length increasing in longitudnal diraction then it will be reduce from lateral diraction
(iv) false
presence of bcc ont affected by bcc
its totally based on type of matallic compouns p
(III )
it also true
this type of metal are 99.9% pure because - a lattice position that is vacant because the atom is missing.
Interstitial - an atom that occupies a place outside the normal lattice position. It may be the same type of atom as the others (self interstitial) or an impurity interstitial atom
(ii) true
stiffness is property of every material depentent on elastic modulus
in E obtained by proportional limit from Stress strain curve
Material Bond energy (eV/bond) Melting point (°C) Ionic CaCl 6.747 646 NaCl 7.96 801 LiF 10.45 870 CuF2 26.85 1360 Al2O3 157.46 3500 Covalent Ge 3.26 958 GaAs 3.26 1238 Si 3.66 1420 SiC 12.31 2600 Diamond 7.4 3550 Metallic Na 1.13 98 Al 3.22 660 Cu 3.52 1083 Fe 4.22 1535 W 8.75 3370