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Structure-Property Correlation of Hypoeutectic Al-7.6Si Alloys with and without Al-5Ti-1B Grain Refiner
Journal of Scientific & Industrial Research ( IF 0.7 ) Pub Date : 2020-09-23
Prosanta Biswas, Sourabh Gupta, Manas Kumar Mondal, Rahul Bhandari, Susanta Pramanik

Hypoeutectic Al-7.6Si alloy has been developed with and without Al-5Ti-1B grain refiner through the gravity casting method. Effects of 2, 4, and 6 wt % master alloy (Al-5Ti-1B) addition on the microstructural morphology, mechanical properties (percentage elongation (%El) and ultimate tensile strength (UTS)), hardness and fracture behaviour of the Al-7.6Si alloy have been investigated. Unmodified hypoeutectic Al-7.6Si alloy consists of needle and rod-like eutectic Si ((Si)E) particles with sharp corners inside the Alα phase. In the grain refined Al-7.6Si alloy, TiB2 is formed and these TiB2 acts as a potential site for nucleation of Alα grains. Therefore, the grain refined alloys have fine globular Alα grains and fibrous (Si)E phase. The bulk hardness, UTS and elongation (%) are increased in the grain refined alloys. Further, fractography show that the cleavage fracture is reduced in the modified alloy and fine dimple formation is increased.

中文翻译:

有和没有Al-5Ti-1B晶粒细化剂的亚共晶Al-7.6Si合金的结构性能相关性

通过重力铸造法开发了具有和不具有Al-5Ti-1B晶粒细化剂的亚共晶Al-7.6Si合金。添加2、4和6 wt%中间合金(Al-5Ti-1B)对Al的显微组织形态,力学性能(延伸率(%El)和极限拉伸强度(UTS)),硬度和断裂行为的影响已经研究了-7.6Si合金。未改性的亚共晶的Al-7.6Si合金由针和棒状共晶Si((Si)构成Ë)随Al内部尖角颗粒α相。在精制的Al-7.6Si合金晶粒,的TiB 2被形成,并且这些的TiB 2作为用于铝的成核潜在位点α晶粒。因此,晶粒细化的合金具有细小的球状铝α晶粒和纤维状(Si)E相。晶粒细化合金的整体硬度,UTS和伸长率(%)增加。进一步地,断层照相术表明,改性合金中的断裂断裂减少,并且微凹痕的形成增加。
更新日期:2020-09-23
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