Microstructure and Properties of Ag-1.33%Mg-0.54%Ni Alloy after Severe Plastic Deformation and Internal Oxidation

摘要:

高强高导的Ag-1.33Mg-0.54Ni(at%)合金经98%的累积轧制变形和内氧化后用扫描电镜和X射线衍射极图进行微观结构表征，对内氧化前后的传统机械性能进行评价。结果表明，合金内氧化后的硬度、最大抗拉强度、断后延伸率和电阻率分别是1350 MPa, 450 MPa, 6% 和 1.73 μΩ·cm。织构研究表明，在内氧化过程中织构保持稳定，主要是{110}<001>高斯织构和{110}<112> 黄铜织构。在银基体中MgO和NiO等相阻碍了晶粒的生长、保持晶粒取向稳定和显著提高合金的机械性能

Abstract:

Ag-1.33Mg-0.54Ni (at%) alloy with high strength and high electrical conductivity, was subjected to accumulative rolling with 98% thickness reduction and internal oxidation, and studied by scan electron microscope (SEM) and X-ray diffraction (XRD). Conventional mechanical properties before and after internal oxidation were evaluated. Results show that the hardness, tensile strength, tensile elongation and electrical resistivity of the alloy after internal oxidation were 1350 MPa, 450 MPa, 6% and 1.73 μΩ·cm, respectively. Further, texture studies suggest that the alloy during internal oxidation had the {110}<001> Goss and {110}<112> Brass textures. A few of MgO and NiO precipitates in a silver matrix hindered the growth of Ag grains and kept the orientation of Ag grains quite stable and enhanced the mechanical properties of the alloy