Abstract

Additive manufacturing, which includes a set of technologies for manufacturing complex-shaped products with the required set of properties, is currently being widely developed. Most additive technologies are associated with the manufacture of the product by melting and fusion of metal powder particles by means of laser radiation. Eutectic aluminum alloys of the Al–Ca, Al–Ce, Al–La, and Al–Ni systems, which have excellent casting properties, are supposedly promising for use in additive technologies. However, there is very little information in the literature on the effect of laser processing on such eutectic structures. In this regard, the work investigated the effect of laser radiation on the structure and mechanical properties of samples from eutectic compositions, namely, Al–8% Ca, Al–10% La, Al–10% Ce, and Al–6% Ni. To do this, the continuous laser modification of their surfaces was carried out. The level of hardening was evaluated by measuring the microhardness of the modified surface. The mechanisms of fracture of specimens under tensile testing have been established. It is shown that, in the structure of the modified surfaces of samples of four alloys, the distribution of the second component becomes more uniform compared to the structure of the base metal. In the Al–8% Ca alloy, the greatest hardening effect is observed, which, however, contributes to embrittlement under tensile stress. However, the modified Al–8% Ca alloy is of interest because of its increased hardness and therefore possibly increased wear resistance. On the contrary, laser modification of the surfaces of the Al–10% Ce, Al–10% La, and Al–6% Ni alloy samples provides a lower hardening effect, but increases their tensile strength with the formation of a ductile or mixed ductile and brittle fracture. The results obtained confirm the prospects of using alloys of the Al–Ca, Al–Ce, Al–La, and Al–Ni systems in additive manufacturing.

中文翻译：

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激光表面改性对 Al–8% Ca、Al–10% La、Al–10% Ce 和 Al–6% Ni 共晶铝合金的结构和力学性能的影响

摘要

目前正在广泛开发增材制造，其中包括一套用于制造具有所需属性的复杂形状产品的技术。大多数添加剂技术都与通过激光辐射熔化和融合金属粉末颗粒来制造产品有关。Al-Ca、Al-Ce、Al-La 和 Al-Ni 系统的共晶铝合金具有优异的铸造性能，被认为有望用于添加剂技术。然而，文献中关于激光加工对此类共晶结构影响的信息非常少。在这方面，该工作研究了激光辐射对共晶成分样品的结构和机械性能的影响，即 Al–8% Ca、Al–10% La、Al–10% Ce 和 Al–6% Ni . 去做这个，对它们的表面进行了连续的激光改性。通过测量改性表面的显微硬度来评估硬化水平。已经建立了拉伸试验下试样断裂的机制。结果表明，在四种合金样品的改性表面结构中，与母材结构相比，第二组分的分布变得更加均匀。在 Al–8% Ca 合金中，观察到最大的硬化效果，然而，这会导致拉伸应力下的脆化。然而，改性的 Al–8% Ca 合金因其硬度增加而受到关注，因此可能增加耐磨性。相反，Al–10% Ce、Al–10% La 和 Al–6% Ni 合金样品表面的激光改性提供了较低的硬化效果，但随着韧性或混合韧性和脆性断裂的形成而增加了它们的抗拉强度。获得的结果证实了在增材制造中使用 Al-Ca、Al-Ce、Al-La 和 Al-Ni 系统合金的前景。