Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 16: Problem 5

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

Short Answer

Expert verified
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.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A continuous and aligned fiber-reinforced composite is to be produced consisting of 45 vol\% aramid fibers and 55 vol \(\%\) polycarbonate matrix; the mechanical characteristics of these two materials are as follows: The stress on the polycarbonate matrix when the aramid fibers fail is \(35 \mathrm{MPa}\) (5075 psi). For this composite, compute the following: (a) The longitudinal tensile strength (b) The longitudinal modulus of elasticity

(a) Verify that Equation 16.11, the expression for the ratio of fiber load to matrix load \(\left(F_{f} / F_{m}\right)\), is valid. (b) What is the \(F_{f} / F_{c}\) ratio in terms of \(E_{f}, E_{m}\), and \(V_{f}\) ?

(a) What is the distinction between matrix and lispersed phases in a composite material? b) Contrast the mechanical characteristics of natrix and dispersed phases for fiber-reinforced composites.

Briefly describe pultrusion, filament winding, and prepreg production fabrication processes; cite the advantages and disadvantages of each.

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).
See all solutions

Recommended explanations on Physics Textbooks

Atoms and Radioactivity

Read Explanation

Scientific Method Physics

Read Explanation

Particle Model of Matter

Read Explanation

Nuclear Physics

Read Explanation

Circular Motion and Gravitation

Read Explanation

Electrostatics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free