Development of high functional materials with nanoscale structure by combined process of MA treatment and powder consolidation with underwater shock wave

首先将市售的SUS 304 L粉末（粉末尺寸; 44 μ m）和与Fe、Ni或Cu粉末混合的粉末机械合金化，然后使用水作为压力介质通过圆柱形轴对称爆炸固结来固结粉末以获得纳米尺寸的晶粒。所得压坯在873 ~ 1023 K之间进行盐浴退火。结果表明：（1）采用MA处理与爆炸凝固相结合的方法，在873 K下退火20 min，可获得晶粒尺寸为90 nm的超细晶组织。(2)经1373 K × 1h热处理后，添加4wt%Ni的压坯拉伸强度为570 MPa，延伸率为430%。

Commercially available SUS304L powders (powder size ; 44mum) and the powders mixed with Fe, Ni, or Cu powders were mechanically alloyed at first, and then the powders were consolidated by cylindrical axisymmetric explosive consolidation using water as a pressure medium to obtain nano-size grains. The compacts obtained were annealed between 873K and 1023K in salt bath. As results, (1) by the methods combined MA treatment with explosive consolidation, ultra fine grains with 90nm grain size were obtained by annealing at 873K for 20 min. The heat treatment using reversion from deformation induced martensite to austenite was suggested to obtain ultra fine grain structure in metastaible austenite steels. (2) compacts mixed with 4wt% Ni shows ultimat4e strength of 570MPa and elongation of 430% after heat-treatment at 1373K for 1h by tensile test.