非晶合金条带的爆炸焊接

EXPLOSIVE WELDING OF AMORPHOUS ALLOY RIBBONS

报道了利用爆炸焊接技术对铁基、铁镍基非晶合金条带（厚度约２５μｍ）进行单层和多层爆炸焊接的结果。金相分析结果表明，条带间相互结合良好；Ｘ光衍射结果说明，焊接后的条带仍保持非晶态，即使采用表面已有部分晶化的条带进行焊接，焊接后仍转化为非晶态。这说明在焊接过程中条带表面已发生熔化，且冷却速度也可达１０＾６Ｋ／ｓ量级。

Amorphous alloys or metallic glass belongs to a novel class of rapidly solidified alloys, well known for their amorphous structures and excellent properties. Usually.it can only take a very limited number of shapes :thin ribbon, wires or powders. This limitation becomes a major barrier against the spread of the alloys over a wide industrial field. For this reason, a means is necessary to obtain block amorphous alloy. In this paper,the feasibility of bonding amorpious ribbons by explosive means is demonstrated. First,a single ribbon was welded onto a mild steel plate ,Second,the cladding of 20-200 layers of Fe78B13Si6 and Fe40Ni40P14B6 amorphous ribbons,both of them are 25 μm thick and 10cm wide,were made into tube samples and plate samples (Fig. 1). Optical microscope observation and X-ray diffraction analysis were used to check these samples. Results show that the amorphous structure of the alloys still holds after being explosively welded and the welding quality is excellent. Some ribbons initially having crystalline surfaces were also welded,we found that their originally existed α-Fe peak disappeared after the explosive welding. This reveals that fusion and rapid cooling occured at the interfaces between the ribbons during the processing. Finally, it suggests that the deformation of amorphous alloy at lower strain rate is similar to that at commonly used strain rate, but at high strain rate the alloy will show a viscous deformation.