Inductive flash-annealing of bulk metallic glasses.
Inductive flash-annealing of bulk metallic glasses.
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DOI：
10.1038/s41598-017-02376-x
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发表时间：
2017-05-19
影响因子：
4.6
通讯作者：
Pauly S
中科院分区：
文献类型：
--
作者：
Kosiba K;Pauly S
我们研制了一种温控感应闪光退火装置，将块体金属玻璃(BMG)以规定的速率加热到给定的温度，最高可达200 K/S。随后在水中的瞬时淬火允许保存在结晶的不同阶段获得的微观结构。为了制备先进的BMG基复合材料，在晶化开始时以不同的升温速率对1个锆基和2个CuZr基BMG进行闪速退火热处理。高度可重复性的复合微结构包含均匀分散的晶体和窄的晶体尺寸分布。为了评估目前工艺的局限性，主要源于非均匀感应加热，计算了表面厚度。它被确定为约2.3 mm，这使得可以对相当大的样品进行闪速退火。由共晶Al-Cu合金的片层间距估算出冷却速度约为10~3 K/S，这保证了淬火过程中防止组织的分解。目前的闪光退火工艺适用于多种玻璃形成液，并具有很大的潜力来调整BMG基复合材料的微观结构和力学性能。
We developed a temperature-controlled inductive flash-annealing device, which heats bulk metallic glasses (BMGs) at defined rates of up to 200 K/s to a given temperature. Subsequent instantaneous quenching in water allows preserving the microstructures obtained at various stages of crystallization. One Zr-based and two CuZr-based BMGs were flash-annealed at the onset of crystallization with different heating rates in order to prepare advanced BMG-matrix composites. The highly reproducible composite microstructures contain uniformly dispersed crystals and a narrow crystal size distribution. In order to assess the limitations of the present process, which mainly originate from non-uniform inductive heating, the skin depth was calculated. It is determined to be about 2.3 mm, which enables flash-annealing of rather bulky samples. The cooling rate was estimated from the interlamellar spacing of eutectic Al-Cu alloys to be on the order of 103 K/s. This ensures that decomposition of the microstructure during quenching is prevented. The present flash-annealing procedure is applicable to a wide variety of glass-forming liquids and has a large potential for tailoring the microstructure and, consequently, the mechanical properties of BMG-matrix composites.