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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Mechanical properties of nanostructured and ultrafine-grained iron alloys produced by spark plasma sintering of ball milled powders
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Mechanical properties of nanostructured and ultrafine-grained iron alloys produced by spark plasma sintering of ball milled powders

机译：球磨粉的火花等离子体烧结生产的纳米结构和超细铁合金的机械性能

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Spark plasma sintering of an iron-based powder has been studied. The powder was prepared with three different microstructures: fully annealed (grain size d larger than 10 μm), nanometer sized (d ～30nm) and nanometer sized with silica nanoparticles along grain boundaries (d ～20nm). Spark plasma sintering was carried out at varying pressure (30-60 MPa) and temperature (from 800 to 900 ℃). Shrinkage during sintering was studied by means of densification curves. Near fully dense or fully dense samples were consolidated; depending on the sintering temperature and on thermal stability of the powder, nanostructured, ultrafine-grained and fine grained materials were obtained. Tensile testing demonstrates that the finer the microstructure, the harder and the stronger is the material, and the lower is the uniform deformation.
机译：已经研究了铁基粉末的火花等离子体烧结。制备的粉末具有三种不同的微观结构：完全退火（晶粒尺寸d大于10μm），纳米尺寸（d〜30nm）和纳米二氧化硅颗粒沿晶界（d〜20nm）。火花等离子体烧结是在变化的压力（30-60 MPa）和温度（从800到900℃）下进行的。通过致密化曲线研究了烧结过程中的收缩率。合并了接近全密或全密样品；取决于烧结温度和粉末的热稳定性，获得了纳米结构的，超细颗粒的和细颗粒的材料。拉伸试验表明，组织越细，材料越硬且越坚固，均匀变形越低。

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