Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy

• 作者: Surajit Basak Prosanta Biswas Surajit Patra Himadri Roy Manas Kumar Mondal
• 来源期刊: 矿物冶金与材料学报
• 年，卷（期）: 2021,（7）
• 页码范围: 1174-1185
• 页数: 12页
• 语种: 英文

摘要

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 micro-structural morphology, hardness, tensile strength, elongation, and fracture behaviour of the alloys were studied. The unmodified Al-12.6Si al-loy 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 mi-crostructural modification. The fracture images of the developed alloys exhibit a ductile and brittle mode of fracture at the same time. The Al-5Ti-1B modified alloys have a more ductile mode of fracture and more dimples compared to the unmodified alloy.