| 摘要 |
A fine crystalline thin wire of a cobalt base alloy having a composition of the formula; CokMlBmSin where Co is cobalt; M is at least one of the transition metals of groups IV, V and VI of the periodic table; B is boron; Si is silicon; K, l, m and n represent atom percent of Co, M, B and Si, respectively, and have the following values: k=40-78 l=10-50 m=2-15 n=8-20 and the fine crystal grains in the thin wire having an average size of no more than 5 mu m. A process for producing a fine crystalline thin wire of cobalt base alloy which comprises thermally melting an alloy having a composition of the formula: CokMlBmSin where Co is cobalt; M is at least one of the transition metals of groups IV, V and VI of the periodic table; B is boron; Si is silicon; k, l, m and n represent atom percent of Co, M, B and Si, respectively, and have the following values: k=40-78 l=10-50 m=2-15 n=8-20 and subsequently jetting the molten alloy through a spinning nozzle while rapidly quenching the spun filaments to solidify at a cooling rate of 104-106 K/sec so that a thin wire having crystal grains of no more than 5 mu m in average size will be formed in one stage.
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