The key requirement to consolidate high-energy mechanically alloyed nanocrystalline powders is to achieve densification and particle bonding without impairment in the mechanical properties. Recent demonstrations of consolidation methods involving high shear, pressure and temperature have shown promising results for bonding high strength particulate materials produced by mechanical alloying. In this study, we report the ability of multi-pass high temperature equal channel angular extrusion to produce bulk ferritic alloys from nanocrystalline Fe–Ni–Zr powders. Subsequent microstructural characterizations indicate limited grain growth as the average grain sizes remain smaller than 100 nm after processing temperatures of 600 °C and 700 °C, above which grains reach micron sizes. The compression test results reveal that the alloys exhibit high mechanical strength at room and moderately high temperatures compared to the pure Fe and Fe–Ni alloys without Zr addition.

中文翻译：

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机械合金化后热挤压合成的热稳定铁基合金的高温力学性能和显微组织

固结高能机械合金化纳米晶体粉末的关键要求是在不损害机械性能的情况下实现致密化和颗粒粘结。涉及高剪切力，压力和温度的固结方法的最新演示表明，粘结通过机械合金化生产的高强度颗粒材料的结果令人鼓舞。在这项研究中，我们报告了多道次高温等通道角向挤压能力，可以从纳米晶的Fe-Ni-Zr粉末生产块状铁素体合金。随后的微观结构表征表明，在600°C和700°C的加工温度后，平均晶粒尺寸仍小于100 nm，晶粒生长受到限制，在此温度以上，晶粒达到微米级。