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Introduction and Geological Setting. The Bosum-twi impact crater is centered at 06°32'N and 01°25'W, and is almost completely filled by a lake. Bosumtwi is one of only four known impact craters associated with a tektite strewn field [1]. It is a well-preserved complex impact structure that displays a pronounced rim. The crater is excavated in 2.1-2.2 Ga(More)
Presite Surveys and Model Predictions: In preparation for the scientific drilling of the Lake Bo-sumtwi crater, a wide range of geophysical and petro-physical studies were conducted over the past 10 years. In 1997 a high-resolution airborne geophysical survey revealed a halo-shaped magnetic anomaly [1]. Physical properties of suevites collected north of the(More)
Time-temperature-precipitation (TTP) diagrams deliver important material data, such as temperature and time ranges critical for precipitation during the quenching step of the age hardening procedure. Although the quenching step is continuous, isothermal TTP diagrams are often applied. Together with a so-called Quench Factor Analysis, they can be used to(More)
A previously undescribed high aspect ratio strengthening platelet phase, herein named the Y-phase, has been identified in a commercial Al-Zn-Mg-Cu alloy. Differential scanning calorimetry indicates that this phase only precipitates at temperature and cooling rate of about 150-250 °C and 0.05-300 K/s, respectively. This precipitate is shown to be responsible(More)
In the present study, the dissolution and precipitation behaviour of four different aluminium alloys (EN AW-6005A, EN AW-6082, EN AW-6016, and EN AW-6181) in four different initial heat treatment conditions (T4, T6, overaged, and soft annealed) was investigated during heating in a wide dynamic range. Differential scanning calorimetry (DSC) was used to(More)
The present study introduces an experimental approach to investigate mechanical properties of well-defined non-equilibrium states of Al-Si alloys during cooling from solution annealing. The precipitation behaviour of binary Al-Si alloys during the cooling process has been investigated in a wide cooling rate range (2 K/s-0.0001 K/s) with differential(More)
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