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Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2021-07-18 , DOI: 10.1007/s12613-020-2070-8
Surajit Basak 1 , Prosanta Biswas 1 , Surajit Patra 1 , Manas Kumar Mondal 1 , Himadri Roy 2
Affiliation  

A near eutectic Al-12.6Si alloy was developed with 0.0wt%, 2.0wt%, 4.0wt%, and 6.0wt% Al-5Ti-1B master alloy. The microstructural morphology, hardness, tensile strength, elongation, and fracture behaviour of the alloys were studied. The unmodified Al-12.6Si alloy has an irregular needle and plate-like eutectic silicon (ESi) and coarse polygonal primary silicon (PSi) particles in the matrix-like α-Al phase. The PSi, ESi, and α-Al morphology and volume fraction were changed due to the addition of the Al-5Ti-1B master alloy. The hardness, UTS, and elongation improved due to the microstructural modification. Nano-sized in-situ Al3Ti particles and ex-situ TiB2 particles caused the microstructural modification. The fracture images of the developed alloys exhibit a ductile and brittle mode of fracture at the same time. The Alα5Tiα1B modified alloys have a more ductile mode of fracture and more dimples compared to the unmodified alloy.



中文翻译:

TiB2和Al3Ti对近共晶Al-12.6Si合金组织、力学性能和断裂行为的影响

开发了一种近共晶 Al-12.6Si 合金,其中含有 0.0wt%、2.0wt%、4.0wt% 和 6.0wt% 的 Al-5Ti-1B 中间合金。研究了合金的显微组织形貌、硬度、抗拉强度、延伸率和断裂行为。未改性的 Al-12.6Si 合金在基体状 α-Al 相中具有不规则的针状和板状共晶硅 (E Si ) 和粗多边形初生硅 (P Si ) 颗粒。由于添加了 Al-5Ti-1B 中间合金,P Si、E Si和 α-Al 形貌和体积分数发生了变化。由于微观结构改性,硬度、UTS 和伸长率得到改善。纳米尺寸的原位Al 3 Ti 颗粒和非原位TiB2颗粒引起显微结构改性。所开发合金的断裂图像同时显示出韧性和脆性断裂模式。与未改性合金相比,Alα5Tiα1B 改性合金具有更具延展性的断裂模式和更多的凹坑。

更新日期:2021-07-19
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