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Chapter 7: Problem 33

Briefly cite the differences between recovery and recrystallization processes.

Short Answer

Expert verified
The main differences between recovery and recrystallization processes are: 1. Recovery occurs during continued deformation or cold working, while recrystallization is invoked by heating the material below its melting point after deformation. 2. Recovery reduces the density of dislocations and internal stresses but does not significantly change the grain structure or size, while recrystallization forms new, strain-free grains with improved mechanical properties and different grain sizes. 3. Recovery is a less extensive process compared to recrystallization, and generally does not result in the same level of improvement in mechanical properties. 4. Recrystallization requires providing additional heat energy to enable grain boundary movement and nucleation of new grains, while recovery typically occurs at lower temperatures or as a result of mechanical processes.

Step by step solution

01

Recovery Process

Recovery is a process in which the physical and mechanical properties of a material, such as strength, hardness, and ductility, are returned to their original levels after the material has been worked or deformed (e.g., through cold working). This process is characterized by a decrease in the density of dislocations within the material and the reduction of internal stresses. The atoms in the material move, rearrange, and bind together in response to applied stress, resulting in a reduction of defects without a significant change in the overall grain structure or size.
02

Recrystallization Process

Recrystallization is a process in which new, strain-free grains nucleate and grow in a deformed material, replacing the old, deformed grains. This occurs when a material, typically a metal or alloy, is heated to a temperature below its melting point, resulting in a microstructural change. The new grains will have reduced defects, dislocations, and internal stresses compared to the parent material, and will generally exhibit improved mechanical properties and a change in grain size. In contrast to recovery, recrystallization results in a significant transformation of the material's grain structure.
03

Key Differences

1. Recovery occurs during continued deformation or cold working, while recrystallization is invoked by heating the material below its melting point after deformation. 2. Recovery reduces the density of dislocations and internal stresses but does not significantly change the grain structure or size, while recrystallization forms new, strain-free grains with improved mechanical properties and different grain sizes. 3. Recovery is a less extensive process compared to recrystallization, and generally does not result in the same level of improvement in mechanical properties. 4. Recrystallization requires providing additional heat energy to enable grain boundary movement and nucleation of new grains, while recovery typically occurs at lower temperatures or as a result of mechanical processes.

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Most popular questions from this chapter

A single crystal of a metal that has the FCC crystal structure is oriented such that a tensile stress is applied parallel to the \([110]\) direction. If the critical resolved shear stress for this material is \(1.75 \mathrm{MPa}\), calculate the magnitude(s) of applied stress(es) necessary to cause slip to occur on the (111) plane in each of the [1\overline{110], [10\overline{1} ] } \text { and } [ 0 1 \overline { 1 } ] \text { directions. }

Consider a single crystal of some hypothetical metal that has the FCC crystal structure and is oriented such that a tensile stress is applied along a [102] direction. If slip occurs on a (111) plane and in a [101] direction, compute the stress at which the crystal yields if its critical resolved shear stress is \(3.42 \mathrm{MPa}\).

(a) Define a slip system. (b) Do all metals have the same slip system? Why or why not?

An undeformed specimen of some alloy has an average grain diameter of \(0.040 \mathrm{~mm}\). You are asked to reduce its average grain diameter to \(0.010 \mathrm{~mm}\). Is this possible? If so, explain the procedures you would use and name the processes involved. If it is not possible, explain why.

Two previously undeformed cylindrical specimens of an alloy are to be strain hardened by reducing their cross-sectional areas (while maintaining their circular cross sections). For one specimen, the initial and deformed radii are \(16 \mathrm{~mm}\) and \(11 \mathrm{~mm}\), respectively. The second specimen, with an initial radius of \(12 \mathrm{~mm}\), must have the same deformed hardness as the first specimen; compute the second specimen's radius after deformation.
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