Armor-Piercing Bullet Turned to Dust When Fired at Composite Metal Foam
Essentially a metal sponge consisting of hollow metal beads within solid metal, composite metal foam (CMF) generally retains some physical properties of its base materials. While its defining characteristic is ultra-high porosity, CMF boasts 5 to 6 times greater strength as well as over 7 times higher energy absorption than previously developed metal foams. Typically created by melting aluminum around hollow metal spheres, it is impressively 70% lighter than sheet metal and 80 times more energy absorbent than steel.
The foam is claimed to be non-toxic, resistant to radiation, fire and heat resistant.
Youtube video (13 seconds) https://www.youtube.com/watch?v=lWmFu-_54fI
Related video (2:30) demonstrates automotive and other applications https://www.youtube.com/watch?v=7uE_f9rXLlk
Slightly different coverage at https://newatlas.com/metal-foam-bullets/42731/
Another Youtube video, demonstrating an explosion - https://youtu.be/yMVEQh5Akcc
(Score: 2) by Runaway1956 on Wednesday April 11 2018, @02:33AM (1 child)
It seems to be shaped in a mold. Fill the mold full of these tiny steel hollow spheres, then pour in the aluminum. Some machining after the molding, yeah, but basically you have molded parts.
Cutting shouldn't be a problem. Any saw blade that can cut aluminum can probably cut this stuff. Expect some fouling, due to the little steel balls. They don't get very specific about the size of the hollow spheres, but I expect that your cuts will be a little rough. Unlike ceramic or similar armor, this stuff isn't especially hard. It relies on the little hollow spheres being crushed to absorb and distribute energy.
(Score: 2) by Arik on Wednesday April 11 2018, @03:37AM
If laughter is the best medicine, who are the best doctors?