工艺参数对玻璃包覆铁基合金微丝尺寸、结构和力学性能的影响

以玻璃包覆Fe_(69)Co_(10)Si_8B_(13)合金微丝为研究对象,研究了拉丝速率及冷却条件对微丝尺寸、结构及力学性能的影响;分析了不同冷却条件下微丝的拉伸断裂机制. 结果表明:当拉丝速率由5m·min~(-1)增加到400m·min~(-1)时,微丝及芯丝直径分别由95.2μm和26.9μm减小到14.5μm和7.2μm;拉丝速率由50m·min~(-1)增加到400m·min~(-1)时,芯丝抗拉强度由1305MPa增大到5842MPa;冷却距离小于20mm时,微丝尺寸和抗拉强度均随冷却距离的增大而显著减小;冷却距离大于20mm时,冷却距离对微丝尺寸和抗拉强度的影响很小;采用水冷方式且拉丝速率大于5m·min~(-1)时所获得的微丝均为非晶态结构,而采用空冷方式制备的非晶态微丝的拉丝速率应大于或等于20m·min~(-1);芯丝的断裂方式为伴随不均匀塑性流变的脆性断裂,且脆性断裂倾向随冷却距离的增加而增大.

Influence of process parameters on the sizes,structure and mechanical properties of glass-coated Fe-based alloy microwires

Taking glass-coated Fe_(69)Co_(10)Si_8B_(13) alloy microwires as an example, the dependences of sizes, microstructure and mechanical properties of microwires on drawing speed and cooling condition were analyzed, and the tensile fracture mechanism of the microwires under different cooling conditions was discussed. The results show that, with the drawing speed increasing from 5m·min~(-1) to 400m·min~(-1), the diameters of microwires and core-wires decrease from 95.2μm and 22.7μm to 14.5μm and 7.2μm respectively, and the tensile strength of core-wire increases from 1305MPa to 5842MPa. As the cooling distance is less than 20mm, the sizes and mechanical properties of microwires decrease drastically with the cooling distance increasing, but the influences of cooling distance on them are not obvious as the distance exceeding 20 mm. As water cooling is applied and the drawing speed exceeds 5m·min~(-1), all the core-wires are amorphous. Applying air cooling, the drawing speed should exceed 20m·min~(-1) to obtain amorphous core-wires. The core-wires exhibit brittle fracture mode accompanied by uneven plastic flow and the brittle tendency increases with the cooling distance increasing.