The Influence of Grain Refiner on Dendrite Arm Spacing of Aluminum Alloy ADC 12  

Oleh:

Suharno, Bambang ; Nanda, Is Prima ; Harjanto, Sri ; Lirachandra, Erika

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI
Dalam koleksi: Jurnal Sains Materi Indonesia vol. 8 no. 2 (Feb. 2007), page 121-124.
Topik: Grain refiner; dandrite arm spacing; fluidity; aluminum alloy ADC 12

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ112.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

ADC 12 is the common used materials for die casting process in producing automotive components.grain refiner was added to aluminum ADC 12 to increase mechanical properties by decreasing grain size and improving fine distribution of gas porosity.Grain refiner also give positive effect in aluminum fluidity, whee the proper addition of grain refiner will increase the fluidity.The purpose of present research is determining correlation between grain refiner addition and dendrite arm spacing, which also indirectly related to the grain size. 100% scrap of aluminum ADC12 and A15ti1B grain refiner were used as raw materials.Melting process has been done in a 1400 gr crubicle with cokes and oxygen as the fuming energy.Argon was introduced into crubicle at least in 1 minute for degassing.After degassing process accomplished, 0, 0.05, 0.1, 0.15, 0.2% grain refiner A15TiB, which have been choosen as experimental variable, were charged into crubicle.Vacuum suction machine has been utilized to measure the aluminum fluidity at 680 degree C, the common ADC 12 pouring temprature.Samples for mirostructural analysis were tooken at the tip of specimen from vacuum suction test. Measurement of dendrite arm spacing (DAS) was conducted by SIGMA SCAN Pro.5 Software. The result indicated that at 680 degree C, the additon up to 0.15% A15TiB grain refinement stopped and DAS increased caused by the complex intermetallic phase (Ti-A1, Ti-B) has nucleated from the excess grain refiner

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