Lecture+3a+-+Structure+of+Materials

Lecture+3a+-+Structure+of+Materials - Structure and...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Structure and Manufacturing Structure and Manufacturing Structure and Manufacturing Structure and Manufacturing Properties of Materials Properties of Materials Lecture 3.a ISE 2204 Introduction to Manufacturing Processes Dr. Jaime Camelio February 2 nd , 2010 Material Structure Importance Crystal Structure Plastic Deformation Grain Boundaries Effect of Temperature Fracture Material Properties ISE 2204 Introduction to Manufacturing Processes Spring 2010 Outline Outline Manufacturing properties are determined largely by the materials mechanical and physical properties Mechanical and physical properties are largely determined by the materials: Crystal structure Grain boundaries Grain size Texture Imperfections ISE 2204 Introduction to Manufacturing Processes Spring 2010 Relevance of Material Properties Relevance of Material Properties Turbine blades for jet engines, manufactured by three different methods: (a conventionally cas (b directionally solidified with columna grains ISE 2204 Introduction to Manufacturing Processes Spring 2010 Motivation Motivation Turbine Blades Turbine Blades (a) conventionally cast; (b) directionally solidified, with columnar grains, as can be seen from the vertical streaks; and (c) single crystal. Although more expensive, single-crystal blades have properties at high temperatures that are superior to those of other blades. Source: Courtesy of United Technologies Pratt and Whitney. When metals solidify, atoms arrange themselves into various orderly configuration, called crystals. The arrangement of the atoms in the crystal is called crystalline structure called crystalline structure . The smallest group of atoms showing the characteristic lattice structure of a particular metal is known as a unit cell . Three basic patterns of atomic arrangement Body-centered cubic (bcc) Face centered cubic fcc ISE 2204 Introduction to Manufacturing Processes Spring 2010 Crystal Structure Crystal Structure Face-centered cubic (fcc) Hexagonal close packed (hcp) The body-centered cubic (bcc) crystal structure: (a) hard-ball model; (b) unit cell; and (c) single crystal with many unit cells. Common bcc metals include chromium, titanium, and tungsten. The face-centered cubic (fcc) crystal structure: (a) hard-ball model; (b) unit cell; and (c) single crystal with many unit cells. Common fcc metals include aluminum, copper, gold and silver. Th h l k d (h t ISE 2204 Introduction to Manufacturing Processes Spring 2010 Common Crystal Structures Common Crystal Structures The hexagonal close-packed (hcp) crystal structure: (a) unit cell; and (b) single crystal with many unit cells. Common hcp metals include zinc, magnesium and cobalt....
View Full Document

This note was uploaded on 02/14/2010 for the course ISE 2204 taught by Professor Rhsturges during the Spring '08 term at Virginia Tech.

Page1 / 21

Lecture+3a+-+Structure+of+Materials - Structure and...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online