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HRTEM observation of the fine precipitate at the early stage of aging in Al-Mg-Si-Cu alloy.

Matsuda K., Ikeno S., Sato T.

Archives of Materials Science

2005

Vol. 26, nr 1-2

59-63

The effect of copper on precipitation sequence of Al-Mg-SI alloys has been studied and discussed by many researchers. However, there is no suitable explanation yet. We studied the precipitation sequence of this alloy by using the high-resolution transmission electron microscopic (HRTEM) technique and several metastable phases and their crystal structures as well as the lattice parameter determined in our previous research. Recently, we have found that the segregation of copper occurs at the interface between the Q'-phase in the Al-Mg-Si-Cu alloy by energy-filtering TEM (EFTEM). In this work, we found a new precipitate, which existed in samples of Al-Mg-Si-Cu alloy aged at low temperature and had an elongated shape.

Ignition properties of cornstarch dust-air mixture

Matsuda T., Sato T., Benkiewicz K., Hayashi A.K.

Archivum Combustionis

2001

Vol. 21 nr 2

83-91

Study of gas-solid two-phase mixtures has been performed recently in many different ways. One of the ultimate purposes of this study is to prevent dust explosion accidents. The present study focuses on experimentally measuring ignition delay times to provide data for numerical analyses. Experiments are performed using a vertical shock tube to ignite the reactive dust layer on the bottom of the tube by a high temperature and high pressure condiction behind a reflected shock wave. Cornstarch dusts are selected as reactive dust particles. Ignitions of the dust particles are detected and ignition delay times are also measured. These values agree well with the published data to the Arrhenius plots as far as the similar experimental system is concerned.