Abstract In this study using accumulative press bonding (APB) process, bimetal AA1060 and AA5083 have been fabricated. The aluminum bars were first press bonded and then this process continued up to five pressing steps. In the APB process, the composite samples were preheated at 320°C for 7 min before each pressing step. Mechanical-properties-of the-AA1060-AA5083 composites were appraised in appraisal to AA1060-AA1060 and AA15083-AA5083 accumulative press bonded single alloy MMCs, and this is done for the first time as its novelty. It was found that both aluminum alloys deform in the same way in the AA1060-AA5083 composites-up-two-APB steps and then AA5083 layers began to neck. Also, it was found that the average strength of the AA1060-AA5083 composites is more than that of these-two-single-alloy MMCs. Moreover, by using-scanning-electron-microscopy (SEM), the effect of APB steps on the fracture surfaces of bi alloy composites have been investigated.

Abstract Today, the vermicompost production process is considered one of the most economically, hygienically, and environmentally friendly methods for the stabilization of organic waste. The aim of this paper was to investigate the effect of food waste preparation time without initial modification and without continuous aeration on the vermicompost process before feeding the worms with organic waste material in order to pass the calorific stage of decomposition of organic matter and not to damage the worms that are sensitive to high temperatures, and the process of fertilizer production is faster, organic matter is composted for a while without the presence of worms. In this paper, four periods, including 0, 7, 14, and 21 days of waste preparation, were examined. The results showed that the difference in ratio between different preparation times was significant 7-14 days the most suitable time for waste preparation without initial modification was obtained.