Abstract

The effect of the annealing temperature and of a constant magnetic field on decomposition of quenched beryllium bronze BrB-2 is studied by scanning electron microscopy for the first time. A technical bronze alloy BRB-2 is kept at a temperature of 800°C for 0.5 h, quenched in water, and subjected to artificial aging at 325, 350, and 400°C for 1 h under a constant magnetic field of 0.7 T and without it. The decomposition of the alloy proceeds simultaneously by several mechanisms, including a discontinuous (cellular) decomposition. For the first time, a specific decomposition mechanism is reported near the triple junctions and near the grain boundaries. The activation barriers for discontinuous decomposition near the triple junctions in a constant magnetic field decrease, the growth rates noticeably increase, and the size of cells decreases almost twofold. The microstructure data are compared with the results of the microhardness and X-ray diffraction measurements. A possible mechanism of the impact of a constant magnetic field on the discontinuous decomposition in copper-based alloys is discussed.

中文翻译：

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退火温度和恒定磁场对淬火铍青铜BrB-2分解的影响

摘要

首次通过扫描电子显微镜研究了退火温度和恒定磁场对铍青铜铍青铜BrB-2分解的影响。将工业青铜合金BRB-2在800 T的温度下保持0.5 h，在水中淬火，然后在0.75 T，700 T的恒定磁场和325、350和400°C的温度下进行人工时效1 h。没有它。合金的分解通过多种机制同时进行，包括不连续（蜂窝）分解。首次报道了在三重结附近和晶界附近的特定分解机制。在恒定磁场下，三重结附近的不连续分解的激活势垒降低，生长速率显着提高，细胞的大小几乎减少了两倍。将显微组织数据与显微硬度和X射线衍射测量结果进行比较。讨论了恒定磁场对铜基合金不连续分解的影响的可能机理。