In-situ heating TEM observation of solidification cell evolutions in an Al-Fe alloy built by laser-powder bed fusion

IF 4.2 Q2 ENGINEERING, MANUFACTURING Additive manufacturing letters Pub Date : 2024-10-28 DOI:10.1016/j.addlet.2024.100251
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Abstract

Cellular structures (i.e., solidification cells) are a unique feature within alloys fabricated through rapid solidification, such as laser-powder bed fusion (L-PBF). Ever since the report of these structures’ beneficial effects on the material's mechanical properties, numerous studies have been devoted to the understanding of their formation mechanisms. Yet, the integrity and stability of the cellular structures are often less investigated, despite their significance on property interpretation and evolution. In this work, a stepwise in-situ heating transmission electron microscopy (TEM) experiment was performed on the exemplary LPBF-fabricated AlFeSiMoZr alloy. A critical threshold of 325 °C was identified, beyond which the cellular structures start to decompose in conjunction with precipitate coarsening. Preferred precipitate nucleation sites and their subsequent coarsening kinetics were determined and presented. Nanometer-sized crystalline embryos (3.81 ± 0.66 nm) were discovered within the cellular structure boundaries in their as-built condition, offering new insights on the precipitate formation and evolution at elevated temperatures.
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原位加热 TEM 观察激光粉末床熔融法制造的 Al-Fe 合金中凝固单元的演变过程
晶胞结构(即凝固晶胞)是通过激光粉末床熔融(L-PBF)等快速凝固技术制造合金的一个独特特征。自从这些结构对材料的机械性能产生有利影响的报道发表以来,许多研究都致力于了解它们的形成机制。然而,细胞结构的完整性和稳定性往往研究较少,尽管它们对性能解释和演变具有重要意义。在这项工作中,对 LPBF 制成的 AlFeSiMoZr 合金进行了分步原位加热透射电子显微镜(TEM)实验。实验确定了一个临界点,即 325 °C,当温度超过这个临界点时,蜂窝结构开始分解,同时析出物也变得粗大。确定并展示了首选沉淀成核点及其随后的粗化动力学。在细胞结构边界内发现了纳米大小的结晶胚(3.81 ± 0.66 nm),为高温下沉淀物的形成和演变提供了新的见解。
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来源期刊
Additive manufacturing letters
Additive manufacturing letters Materials Science (General), Industrial and Manufacturing Engineering, Mechanics of Materials
CiteScore
3.70
自引率
0.00%
发文量
0
审稿时长
37 days
期刊最新文献
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