Magnetism by hitting metal?

  • Thread starter Th3Proj3ct
  • Start date
  • #1
Th3Proj3ct
19
0
If you take a screwdriver for example, and hit it a few times near the tip with a hammer or something hard; why does the screwdriver become magnetic?
I was shown someone doing this, and shortly afterwards it was able to attract nails or screws around.
 

Answers and Replies

  • #2
berkeman
Mentor
63,621
14,735
I've never seen this. Maybe the head of the hammer was magnetized. If anything, hitting a magnetized object generally weakens it magnetization.
 
  • #3
Danger
Gold Member
9,756
253
Actually, we used to do it once in a while just for fun. The metal rod or whatever has to be aligned with magnetic north. It seems that the vibrations loosen up the magnetic domains enough that they react to the Earth's field and turn around. The effect is very weak, though.
 
  • #4
berkeman
Mentor
63,621
14,735
Actually, we used to do it once in a while just for fun. The metal rod or whatever has to be aligned with magnetic north. It seems that the vibrations loosen up the magnetic domains enough that they react to the Earth's field and turn around. The effect is very weak, though.

Ahh, interesting. Thanks for that Danger! I would have never thought of that. Learn something new every dang day here on the PF!
 
  • #5
Danger
Gold Member
9,756
253
Wow... I never thought that I'd get one over on you, especially in this area. :bugeye:
 
  • #6
berkeman
Mentor
63,621
14,735
Wow... I never thought that I'd get one over on you, especially in this area. :bugeye:

:rofl: Pppffffttttt! They don't call you Danger for nothing! :biggrin:
 
  • #7
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,725
2,629
If you take a screwdriver for example, and hit it a few times near the tip with a hammer or something hard; why does the screwdriver become magnetic?
I was shown someone doing this, and shortly afterwards it was able to attract nails or screws around.

Searches using "work hardening", "plastic deformation" and magnetization did yield a large number of articles, for example:

http://ieeexplore.ieee.org/iel5/20/19613/00908685.pdf?arnumber=908685

But I could locate a clear discussion of the subject.
 

Suggested for: Magnetism by hitting metal?

Replies
7
Views
351
Replies
8
Views
405
  • Last Post
Replies
10
Views
319
Replies
1
Views
262
  • Last Post
Replies
11
Views
555
  • Last Post
Replies
2
Views
313
  • Last Post
Replies
5
Views
469
Replies
15
Views
985
Top