Only answer if you know correctly, as itsveryimportant for me, i will surely give helpful tocorrect answer and unhelpful to wronganswers3. What is/are the differences between Macro and Micro grains? What is the importance of micro-grain in nanoscience and technology? An engineer prepared two steel rods by two different methods:(i) Ball milled the steel for 72hrs and hot press the obtained granules (obtained powder from theball mill process), and (ii) melt casting. Which rod will have more strength i.e. hot press or meltcasting (explain and justify your answer)?

Macro grain : The grain size or shape is visible to an naked eye Micro grain : The grain size is…

Answered: What is/are the differences between…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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(a) For a given material, would you expect the surface energy to be greater than,the same as, or less than the grain boundary energy? Why?(b)The grain boundary energy of a small-angle grain boundary is less than fora high-angle one. Why is this so?
Why the volume change as low as 0.5 percent can cause grain fractures during phase transformation of ceramics? Given that the elastic modulus of the ceramic is 250 GPa and Poisson ration is 0.2. You need to calculate the thermal stress due to the volume change
a) On the atomic level, what causes strain hardening? b) Explain the difference between engineering stress and true stress. Under tension, which one is greater, and why?
Using the isothermal transformation diagram for a 0.45 wt% C steel alloy (Animated Figure 10.40), determine the approximate percentages of the microconstituents that form the final microstructure of a small specimen that has been subjected to the following time- temperature treatments. In each case assume that the specimen begins at 845°C (1550°F), and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.
THICK-WALLED PRESSURE VESSELS A steel compound cylinder is formed by shrinking a tube 400 mm outside diameter and 300 mm inside diameter on to one of 300 mm outside diameter and 200 mm inside diameter. When subjected to an operating pressure of 200 MPa, the radial pressure generated at the common interface is 75 MNm-². c) The Young's modulus for steel is 210GNm-². Calculate the shrinkage allowance used during the manufacture of this compound cylinder.
a) Sketch and label tensile stress-strain curves for a typical BCC and FCC metal and explain the salient differences from a slip system perspective Explain the Fick’s two laws of diffusion and discuss their common uses. What atomic factors govern the extent of solid solubility?
Please provide a detailed solution. Explanation required for the formula used.
In fabrication of the high-temperature turbine blades, if you wished to minimize the centrifugal forces on the blades leading to failure, which materials science strategy would be best: Select one: Oa. Orient the crystals from the root of the blade to the apex Ob. Use an amorphous material O c. Orient the crystals perpendicular to the line from the root of the blade to the apex Od. Orient the crystals randomly
A process that is used to make high-quality technical ceramics is called sintering (see images below). During the early stage of sintering, individual particles are attached by the formation of necks. How do the so-called necks form? (In other words, what processes are occurring that cause the necks to form?)
I need the answer by handwriten
(c) Explain the reason of FCC metals are often recommended for use at low temperatures, particularly when any sudden loading of the part is expected.
Given the following values, calculate their relative compactness ydmax=2,250 Kg/cm?, ydmin=1,120 Kg/cm?, ydnat=1,635 Kg/cm?,

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