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Chapter 16: Problem 5

Cite one similarity and two differences between precipitation hardening and dispersion strengthening.

Short Answer

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Answer: One similarity between precipitation hardening and dispersion strengthening is that both processes increase material strength by obstructing dislocation movement. Two differences are: 1) the method of introducing the strengthening agents - precipitation hardening uses a heat treatment process, while dispersion strengthening incorporates particles during fabrication techniques; and 2) the type of particles involved - precipitation hardening involves precipitates from the same material as the matrix, while dispersion strengthening uses particles made of different materials, such as ceramics or carbides.

Step by step solution

01

Understand Precipitation Hardening

Precipitation hardening, also known as age hardening, is a heat treatment process that helps to strengthen and harden materials such as alloys. In this process, a supersaturated solution of an alloy undergoes controlled heating and cooling steps, leading to the formation of precipitates. These precipitates obstruct dislocation movement, which in turn significantly increases the strength and hardness of the material.
02

Understand Dispersion Strengthening

Dispersion strengthening, on the other hand, is a process that involves the incorporation of finely dispersed particles within a material, usually a metal or alloy. These particles impede dislocation movement, leading to an increase in the strength and hardness of the material. Dispersion strengthening can be performed during the fabrication process of materials using techniques like powder metallurgy or mechanical alloying.
03

Identify One Similarity

One similarity between precipitation hardening and dispersion strengthening is that the main mechanism behind the strengthening in both processes is the obstruction of dislocation movement. In both cases, the formation of precipitates or the dispersion of particles obstructs the movement of dislocations, leading to an increase in the material's strength and hardness.
04

Identify Two Differences

The first difference between these two processes is the method of introducing the strengthening agents. In precipitation hardening, the precipitates are formed through a controlled heat treatment process whereas in dispersion strengthening, the dispersed particles are incorporated into the material during fabrication techniques like powder metallurgy or mechanical alloying.
05

Another Difference

Another difference between these processes is the type of particles involved. In precipitation hardening, the precipitates are usually formed from the same material as the matrix (i.e., the alloy undergoing heat treatment), while in dispersion strengthening, the dispersed particles are typically made of different materials, such as ceramics or carbides. In conclusion, precipitation hardening and dispersion strengthening share a similarity in the mechanism of increasing material strength by obstructing dislocation movement but differ in how the strengthening agents are introduced and the types of particles involved.

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Most popular questions from this chapter

It is desired to produce an aligned carbon fiber-epoxy matrix composite having a longitudinal tensile strength of \(500 \mathrm{MPa}(72,500 \mathrm{psi})\). Calculate the volume fraction of fibers necessary if (1) the average fiber diameter and length are \(0.01 \mathrm{~mm}\left(3.9 \times 10^{-4}\right.\) in.) and \(0.5 \mathrm{~mm}\left(2 \times 10^{-2}\right.\) in.), respectively; (2) the fiber fracture strength is \(4.0\) GPa \(\left(5.8 \times 10^{5} \mathrm{psi}\right)\); (3) the fiber-matrix bond strength is \(25 \mathrm{MPa}\) (3625 psi); and (4) the matrix stress at composite failure is \(7.0 \mathrm{MPa}\) (1000 psi).

(a) From the moduli of elasticity data in Table \(16.2\) for glass fiber- reinforced polycarbonate com- posites, determine the value of the fiber efficiency parameter for each of 20,30 , and 40 vol\% fibers. (b) Estimate the modulus of elasticity for 50 vol \(\%\) glass fibers.

Compute the longitudinal tensile strength of an aligned glass fiber-epoxy matrix composite in which the average fiber diameter and length are \(0.015 \mathrm{~mm}\left(5.9 \times 10^{-4}\right.\) in. \()\) and \(2.0 \mathrm{~mm}(0.08\) in. \()\), respectively, and the volume fraction of fibers is \(0.25\). Assume that (1) the fiber-matrix bond strength is \(100 \mathrm{MPa}(14,500 \mathrm{psi}),(2)\) the fracture strength of the fibers is \(3500 \mathrm{MPa}\left(5 \times 10^{5} \mathrm{psi}\right)\), and (3) the matrix stress at composite failure is \(5.5 \mathrm{MPa}(800 \mathrm{psi})\).

Briefly describe laminar composites. What is the prime reason for fabricating these materials?

For a continuous and oriented fiber-reinforced composite, the moduli of elasticity in the longitudinal and transverse directions are \(33.1\) and \(3.66\) GPa ( \(4.8 \times 10^{6}\) and \(\left.5.3 \times 10^{5} \mathrm{psi}\right)\), respectively. If the volume fraction of fibers is \(0.30\), determine the moduli of elasticity of fiber and matrix phases.
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