The term 'aramid fibre' refers to a manufactured fibre in which the fibre-forming substance is a long-chain synthetic polyamide with at least 85% of the amide linkages attached directly to two aromatic rings (Preston, 1978; Yang, 1993). 'para-Aramid fibres' are those in which the amide Iinkages are in the para (l,4) positions on the aromatic rings. para-Aramid fibres of poly(para-phenyleneterep...

By combining differential scanning calorimetry analysis and high-resolution transmission electron microscopy observations, the precipitation map for Al–Cu–Mg alloy (AA2024-T3) is obtained a wide temperature range from 85 to 250 °C ageing durations 1 10,000 h. For first time, appearance of equilibrium S–Al2CuMg phase observed at 1000 h ageing. Hardness values superposed with reveal that maximum ...

The consequences of hydrogen on the formation and growth GP zones during natural ageing in an Al-5Cu alloy is investigated experimentally down to atomic scale numerically using ab initio calculations. As observed through scanning/transmission electron microscopy, hardening kinetic delayed due a slower when incorporated. According calculations, results from trapped vacancies that reduces signifi...