Metals with what type of crystal lattice less prone to brittle fracture?

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Discussion Overview

The discussion revolves around the relationship between crystal lattice structures in metals and their susceptibility to brittle fracture. Participants explore the characteristics that contribute to ductility and brittleness in metals, including tensile strength and atomic behavior under stress.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that steel, specifically AISI 1060 with 0.6% carbon, exhibits high ultimate tensile strength, which may contribute to its performance against brittle fracture.
  • Others mention tungsten's tensile strength and density, comparing it to steel but do not conclude its effectiveness against brittle fracture.
  • One participant explains that ductility in metals is related to the behavior of valence shell electrons, which allows atoms to slide past each other under tension.
  • Another participant defines brittleness as the tendency of materials to fail under stress without significant plastic deformation, contrasting it with ductility and malleability.

Areas of Agreement / Disagreement

Participants express varying views on which crystal lattice structures are less prone to brittle fracture, with no consensus reached on a definitive answer. The discussion includes differing definitions and characteristics of ductility and brittleness.

Contextual Notes

Some claims depend on specific definitions of ductility and brittleness, and there are unresolved aspects regarding the influence of crystal lattice types on these properties.

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Metals with what type of crystal lattice less prone to brittle fracture? Why?
 
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What makes a metal ductile? What is the difference between ductile and brittle?
 
Tensile strength...


Metals with what type of crystal lattice less prone to brittle fracture? Why?

My answer would be Steel (AISI 1060 0.6% carbon), because it has the highest ultimate tensile strength for a metallic lattice at 2,200-2,482 MPa and density 7.8 g/cm^3.

Tungsten is at 1,510 MPa and density 19.25 g/cm^3.
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Reference:
http://en.wikipedia.org/wiki/Tensile_strength#Typical_tensile_strengths"
 
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Ductility occurs in materials where valence shell electrons are not rigidly bound and are thus shared. These electrons atoms to slide past each other without breaking. It occurs under tension.

Brittleness is the tendency of a material to fail under stress, usually tension, rather than deform. It's not normally applied to shear. Generally, if there is little or no plastic deformation before failure, the material is said to be brittle.

Malleability is similar, but not identical, as it involves deformation under compression. Gold, for example, is both ductile and malleable, but lead is only malleable.
 

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