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纳米晶合金-掺硼Ni_3Al金属间化合物和Al合金1420(Al-5.5％Mg-2.2％Li-0.12％Zr),以及亚微米晶铝合金1420经过了两种急剧塑性变形法的处理,即通过施加大压力状态下的扭曲应变的加工和等路径斜向挤压加工(ECAP)。这样加工的超细晶粒(UFG)合金表现出了在相对低的温度和/或高应变速率条件下的增强超塑性。本文根据透射电子显微镜/高分辨率电子显微镜(TEM/HREM)的分析结果讨论了超细晶粒合金超塑性行为的特点以及获得增强超塑性的条件。
The nanocrystalline alloy-boron-doped Ni_3Al intermetallics and Al alloy 1420 (Al-5.5% Mg-2.2% Li-0.12% Zr) and submicron crystalline aluminum alloy 1420 were subjected to two rapid plastic deformation treatments Torsional strain processing and equal path diagonal extrusion (ECAP) under high pressure conditions. The ultra-fine grain (UFG) alloy machined in this way exhibits enhanced superplasticity at relatively low temperatures and / or high strain rates. In this paper, the superplastic behavior of ultrafine-grained alloys and the conditions of enhanced superplasticity are discussed based on TEM / HREM analysis.