The strategy to combine nano-grain strengthening and nanoprecipitation strengthening should be generally applicable to developing other ultra-strong metallic alloys.Īustenitic stainless steels (ASSs) have been widely used in automotive, medical equipment, and nuclear industry areas because of their well-known advantages such as excellent corrosion resistance, good plasticity, high creep resistance, and low cost.

The yield strength of nano-grained and nano-precipitated stainless steel reaches 2.9 GPa, which well exceeds that of ultrafine-grained (100–1000 nm) and nano-grained (<100 nm) stainless steels prepared by other techniques developed in recent decades. 4 nm, leading to strong grain boundary strengthening and dispersion strengthening effects, respectively. The achieved alloy has an average grain size of 30 ± 12 nm and contains a high density (~10 24 m −3) of lanthanum-enriched nanoprecipitates with an average particle size of approx. We prepared a bulk nanocrystalline lanthanum-doped 304L austenitic stainless steel alloy by a novel technique that combines mechanical alloying and high-pressure sintering.

Austenitic stainless steel has high potential as nuclear and engineering materials, but it is often coarse grained and has relatively low yield strength, typically 200–400 MPa.

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