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 

机构地区：[1]Department of Metallurgical and Materials Engineering,National Institute of Technology,Durgapur,Durgapur-713209,West Bengal,India [2]Department of NDT and Metallurgy Group,CSIR-Central Mechanical Engineering Research Institute,Durgapur-713209,West Bengal,India

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第7期1174-1185,共12页矿物冶金与材料学报（英文版）

基　　金：The authors would also like to thank NIT,Durgapur RIG#2 project for financial support and the Director of National In-stitute of Technology Durgapur,India,for his continuous en-couragement.

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-likeα-Al phase.The P_(Si),E_(Si),andα-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 TiB_(2)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.

关 键 词：Al−Si alloy Al−5Ti−1B modification modification mechanism mechanical properties fracture analysis 

分 类 号：TG146.21[一般工业技术—材料科学与工程]