best tensile strength for a metallic armor plating?

am curious as to what kind of metallic alloy could be used if an armored suit were possible. so to that extent, I was wondering what the best tensile strength of any metal is, or alloy combination would work best. something that could stop a NATO .50 in its tracks (or atleast stop/deflect it with enough strength left over to repeat the process several times without failure).

im told titanium has excellent tensile strength, but that tungsten would be the best when it comes to heat resistance and blunt force trauma because of its density.

any ideas from anyone experienced with metallurgy would be appreaciated, frankly if you have to google it, then your not the person I want to see an answer from. I can use google, and it doesn't render the information I want.