Microstructural analysis of aluminium alloy 2096 as a function of heat treatment.
作者： Andrew Williams
DOI:
关键词: Misorientation 、 Stress corrosion cracking 、 Precipitation (chemistry) 、 Grain boundary 、 Metallurgy 、 Transmission electron microscopy 、 Grain boundary strengthening 、 Materials science 、 Aluminium alloy 、 Alloy
摘要: A detailed microstructural investigation into possible metallurgical culprits of stress corrosion cracking (SCC) Al-Li-Cu alloy AA2096 was carried out as a function isothermal aging time at 160°C. Two tempers were analysed for this study: under-aged 4 hours (UA4) and 12 (UA12). Transmission electron microscopy (TEM) used to document T1 (Al2CuLi) precipitation near on low high angle misorientation grain boundaries. The low-angle boundaries the UA4 temper exhibited fine, continuous decoration precipitates narrow, but distinct precipitate free zone (PFZ) adjacent boundary. either showed no boundary precipitation, or contained single, large that grew along causing it pucker. UA12 such PFZ, with greater than observed in matrix. An energy dispersive X-ray (EDX) study conducted investigate occurrence copper solute depletion across In temper, copped depleted corresponded PFZ observed.
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