面向太空制造的非晶合金条带的低温热塑性焊接

Low-temperature thermoplastic welding of metallic glass ribbons for in-space manufacturing

太空制造是航天技术领域中新兴的研究方向,可促进太空探索的发展.微重力、高真空等极端太空环境对金属材料的太空制造技术提出了新要求.本文提出了一种热塑性焊接方法,可实现La基非晶合金带的低温焊接.同时,通过第二相强化,将La和Zr基非晶合金混合成"三明治"结构,使其热塑性焊接样品的断裂强度和拉伸应变比La基焊接样品分别提高了19%和39%.这表明,非晶合金是一种理想的太空制造模型材料,可在非熔化状态下低温制造,且具有良好的力学性能.另外,该低温热塑性制造技术还可以具有可行的加工时间窗口.研究表明,非晶合金具有的低温热塑性焊接特性使其在金属材料的太空制造领域中具有重要应用前景.

In-space manufacturing is an emerging and promising research field in space industry,which benefits the development of space explorations.Owing to the microgravity,high vacuum and complexity of the space environment,a special manufacturing strategy for alloys is highly demanded for the in-space manufacturing.Herein,a lowtemperature thermoplastic metallic welding method was proposed and employed for La-based metallic glass ribbons.With the sandwiched structures of La-and Zr-based ribbons,the welded samples exhibit a competitive fracture strength and an increased tensile strain than those of the welded la-based samples due to the second phase strengthening.This suggests that metallic glass is an ideal material candidate for in-space manufacturing,and can be well manufactured at a nonmelting state with good mechanical performances.In addition,the thermoplastic manufacturing method can also feature a moderate processing time window.In general,this work presents the promising potential of low-temperature thermoplastic welding strategy for in-space manufacturing of metallic materials.