Natural Aging Behaviour Of AA6111 Aluminium

In the continuing drive for weight reduction in new automobile designs, the 6000 series aluminium alloys have emerged as the most promising age-hardenable body sheet material in the automotive industry. Currently, one of the body sheet alloys used for its combination of strength and formability in the (T4) temper is AA6111, an Al-Mg-Si-Cu alloy. The T4 behaviour of AA6111 has been investigated by means of tensile testing, microhardness measurements, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and X-ray analysis. The results show that AA6111 attains a monotonic strength after approximately 120 h of natural aging. The microstructure consists of an aluminium matrix and angular intermetallic particles containing mainly Al, Fe, Cu, Si and Mn dispersed within the microstructure. The intermetallic particles are found to possess a structural formula of the type AlxFeSi. Compared with other 6xxx series of alloys under the same T4 condition, AA6111 shows superior strength properties. Natural aging is observed to affect the kinetic reaction of AA6111.Dans la campagne continue pour la réduction en poids dans le nouveau modèle d\' automobile, les séries 6000 d\' aluminium en alliage ont émergé comme le matériau de feuille de carrosserie la plus prometteuse endurcirable avec l\'âge dans l\'industrie de l\' automobile. Actuellement, l\' un d\' alliage de feuille de carrosserie utilisé pour sa combinaison de solidité et formabilité dans la trempe (T4) AA6111 un alliage de Al-Mg-Si- Cu. Dans cet article, le comportement T4 de AA6111 a été étudié au moyen de l\'essai de traction, l\'évaluation de microdureté, la calorimétrie de balayage différentiel (CBD), la microscopie électronique à balayage (MEB) et l\'analyse radioscopique. Les résultats montrent que AA6111 atteint une solidité monotone après approximativement 120 h de vieillissement naturel. La microstructure consiste d\'une matrice d\' aluminium et les particules intermétalliques angulaires contenant principalement Al, Fe, Cu, Si, Mn dispersés dans la microstructure. Les particules intermétalliques sont trouvées de posséder une formule structurelle du type Alx Fe Si. Comparé avec d\' autres séries d\' alliage de 6xxx sous la même condition de T4, AA6111 montre les propriétés de solidité supérieure. Les vieillissement naturel est observé d\' influer sur la réaction cinétique de AA6111. Ghana Journal of Science Vol. 47 2007: pp. 91-10

Steady-state creep in polycrysstalline aluminium

No Abstract. Journal of the Ghana Association Vol. 2 (3) 1999: pp.49-5

Buruli ulcer : history and disease burden

A major objective of this open access book is to summarize the current status of Buruli Ulcer (BU) research for the first time. It will identify gaps in our knowledge, stimulate research and support control of the disease by providing insight into approaches for surveillance, diagnosis, and treatment of Buruli Ulcer. Book chapters will cover the history, epidemiology diagnosis, treatment and disease burden of BU and provide insight into the microbiology, genomics, transmission and virulence of Mycobacterium ulcerans. ; Supports further investigation by summarizing state of the art in the field of Buruli ulcer research Enriches understanding of epidemiology of Buruli ulcer in different geographic regions Reviews exhaustively the characteristics of Mycobacterium ulcerans diseas