激光功率对SLM制备非晶合金成形及晶化的影响

Effect of Laser Power on Forming Quality and Crystallization of Amorphous Alloy Prepared by SLM

非晶合金以其独特的原子排列和优异的性能引起人们的广泛关注,但由于尺寸、晶化等问题严重限制了实际工程中的应用,激光增材制造技术具有高升温-冷却速率和逐点熔融沉积的特点,为制备非晶合金提供了新思路。本文采用选择性激光熔融成型技术制备Zr_(50)Ti_(5)Cu_(27)Ni_(10)Al_(8)非晶合金。对制备出的样品的成分和组织结构进行了表征。结果表明,样品主要由非晶相构成,晶化主要发生在热影响区叠加区。随激光功率的降低,晶化区面积和晶化颗粒数量减少。但过低的功率会产生未熔合缺陷和裂纹,严重影响非晶合金的成形质量和非晶率。

Amorphous alloys have attracted extensive attention due to their unique atomic arrangement and excellent properties.However,the size,crystallization and other problems may seriously limit the engineering application.Laser additive manufacturing technology has the characteristics of high heating,cooling rate and point by point melting deposition,which provides a new idea for the preparation of amorphous alloys.Zr_(50)Ti_(5)Cu_(27)Ni_(10)Al_(8) amorphous alloy was prepared on the surface of pure zirconium substrate by selective laser melting technology.The composition and structure of the samples were characterized.The results showed that the samples are mainly composed of amorphous phase,and the crystallization mainly occurs in the superimposed zone of heat affected zone.With the decrease of laser power,the area of crystallization zone and the number of crystallization particles decreased.However,if the laser power is too low,there will be non-fusion defects and cracks,which will seriously affect the forming quality and amorphous rate of amorphous alloy.