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(a) Comparison of alloy costs and (b) the abundance risk level (ARL) of various precipitation hardened ultrahigh strength steels.617 MEA, medium entropy alloy; PH, very tough precipitation-hardening stainless steels with varying contents of chromium, nickel, molybdenum, etc. where the specific alloy values have been given in brackets in the figure. UTS, ultimate tensile strength. Figure is reproduced from ref (617) with permission. Copyright 2022, Nature.
