How Hard Can Lead GET

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Brodie posted this 4 weeks ago

I was reading "Science News" earlier today.  There is an article about how "lead gets stronger than steel" when subjected to massive pressure, equal to what is at the earth's core.  The full paper can be found at: " Extreme hardening of Pb at high pressure and strain rate. Physical Review Letters. Vol. 123, November 15, 2019, p. 205701. doi: 10.1103/PhysRevLett.123.205701.

 

Emmily Conver wrote the short synopsis that I read..  It interested me because I recall a discussion we had about lead and pressures about a year ago.  Any this has been FYI enjoy.


 

B.E.Brickey

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Eutectic posted this 4 weeks ago

The pressures involved are a lot larger than we get in firearms. Of more interest is the temperature effect. at -196 C lead is as hard a steel. Mercury, liquid at room temperature. can make a nice hammer head. All metals have temperature related property.\changes.

At room temperature lead is halfway to its melting point and is soft. Small changes in temperature can cause large property changes in lead alloys.

Steve

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Brodie posted this 4 weeks ago

Steve,  You must have your thermostat set a heck of a lot higher than mine.

B.E.Brickey

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RicinYakima posted this 4 weeks ago

B.E., He is relating in Kelvin degrees, not Fahrenheit, half way from -196 to 327.5 in Centigrade.

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porthos posted this 3 weeks ago

i'/m a little confused. in simple terms; how hard can lead get in BHN #s

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Brodie posted this 3 weeks ago

Under sufficient pressure, from all sides; lead can get harder than steel, according to the synopsis I read.

Ric, even in Kelvin degrees molten lead is still hotter than I want in my shorts.  Relatively it is the same thing no matter what you measure the temperature with C, F, or Kelvin.

B.E.Brickey

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Squid Boy posted this 3 weeks ago

I had this wild idea that I might be able to do that in my bullet swage until I figured out that 400 GP is equal to something a bit over 58,000,000 psi. Doubt the dies could stand it. Squid

"Squid Pro Quo"

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