#1  
18th December 2010, 08:20 PM
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What are the various types of defects found in Metals?


what are the various type of defects that you find in metals?




  #2  
19th December 2010, 02:34 AM
nishant1110
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Default Re: What are the various types of defects found in Metals?

Typical metallic structure doesn't seem to have a defect as such. Yet, metal ions may migrate to interstitial voids, this defect is called Frenkel defect. By reaction with a non-metal on the surface, metals may liberate electrons e.g. Zinc, this defect is called Metal Excess defect due to anionic deficiency.
  #3  
16th January 2011, 09:54 PM
amlendu
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Default Re: What are the various types of defects found in Metals?

hi dear,
broadly there are two types of metal defects:--
1- stiochiometric defect and
2- non-stiochometric defects

stiochimetric defects include
1-schottky defect-due to missing of ions from lattice point in pairs
2-frenkel defects-it is caused dur to the creation of lattice vacancy as a result of misplaced ion in interstial site. it is common in solid ith high co-ordination no.


2---non-stiochometric defects- ratio of positive and negativeion differ from that indicated by chemical formula.
thanks
  #4  
16th January 2011, 11:25 PM
Harshita21
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Default Re: What are the various types of defects found in Metals?

Defects in metal structure are:
1. Dislocations

2. Point Defects
Found in grains of metal's lattice structure

3. Volume Defects
Divided in to three parts
(a) void (b) crack (c) inclusion of foreign particles

Casting Defects : it is of different category defect
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  #5  
17th January 2011, 01:29 AM
khanddn
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Default Re: What are the various types of defects found in Metals?

Dear,
There are so many Types of Defects Found in Metals like Structural defect,interstitial impurity, Substitutional impurities,Dislocation,corrosion etc

Thanks
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  #6  
17th January 2011, 01:59 PM
kvrob139
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Default Re: What are the various types of defects found in Metals?

Quote:
Originally Posted by Unregistered View Post
what are the various type of defects that you find in metals?
Hi,

Following defects are found in metals:
Crystallographic defect
# 1 Point defects
# 2 Line defects
# 3 Planar defects
# 4 Bulk defects

Interstitial defect
# 1 Self-interstitials
# 2 Impurity interstitials

Casting defect
* 1 Shrinkage defects
* 2 Gas porosity
* 3 Pouring metal defects
* 4 Metallurgical defects
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  #7  
18th January 2011, 09:04 AM
Harshita21
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Default Re: What are the various types of defects found in Metals?

welding defect :

sasting defect :

1.Blow
2.Scar
3.Blister
4.Gas hole
5.Pin hole

Moulding material defect :

1.Cut & washes
2.Run out
3.Fusion
4.Swell
5.Metall penetration
6. Rail tail
7. Scrab

Pouring metal defect :

1. Miss run
2. Cold shut
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  #8  
7th February 2011, 03:55 PM
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Default Re: What are the various types of defects found in Metals?

Scrab mould defects?
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  #9  
21st February 2011, 04:22 PM
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Default Re: What are the various types of defects found in Metals?

give types of casting defect
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  #10  
14th October 2011, 10:03 PM
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Default Re: What are the various types of defects found in Metals?

Please I need more explanation on volume defect
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  #11  
15th October 2011, 01:23 AM
imcool.force
 
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Posts: 210
Default Re: What are the various types of defects found in Metals?

Hi dear,
Following defects are found in metals:
Crystallographic defect
# 1 Point defects
# 2 Line defects
# 3 Planar defects
# 4 Bulk defects

Interstitial defect
# 1 Self-interstitials
# 2 Impurity interstitials

Casting defect
* 1 Shrinkage defects
* 2 Gas porosity
* 3 Pouring metal defects
* 4 Metallurgical defects
Thanks
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  #12  
12th November 2011, 12:37 PM
pabitra_nayak
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Posts: 607
Default Re: What are the various types of defects found in Metals?

hi dear,
broadly there are two types of metal defects:--
1- stiochiometric defect and
2- non-stiochometric defects

stiochimetric defects include
1-schottky defect-due to missing of ions from lattice point in pairs
2-frenkel defects-it is caused dur to the creation of lattice vacancy as a result of misplaced ion in interstial site. it is common in solid ith high co-ordination no.


2---non-stiochometric defects- ratio of positive and negativeion differ from that indicated by chemical formula.
thanks
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  #13  
25th August 2013, 02:31 AM
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Default Re: What are the various types of defects found in Metals?

what are the major defects in metals and alloys due to faulty heat treatment
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  #14  
25th August 2013, 11:09 PM
aashisranjan784
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Posts: 8,627
Default Re: What are the various types of defects found in Metals?

Dear Friend

Defect of Imperfection in metals is defined as the irregularities or deviation from the ideal arrangement inside a metal.

It occurs generally when crystallization process occurs at fast or moderate rate.

There various metal defects are as follows:

1.Point Defects

Under this there are three types of defects:

>>Impurity defect

>>Stoichiometric defect

1.Vacany defect

2.Frenkel defect

3.Schottky defect

>>Non stoichiometric defect

2.Line defects:

It is further classified into :

>>Edge dislocation

>>Screw dislocation

3.Surface defects:

>>Internal defect

1.Grain Boundaries

2.Tilt boundaries

3.Stacking fault

4.Twin boundaries.

>>External defect

Hope the information helps you.If you have any more query regarding this you can leave your message here.

All the best

aashisranjan784
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