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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin
R. Ibrahim Purawiardi
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Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of Crystal Structure and Texture on Al-5052 Rod Processed by ECAP and Post-ECAP Annealing at 100-300 oC R. Ibrahim Purawiardi; I Nyoman Gede Putrayasa Astawa
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 14, No 1 (2020): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.14.1.14-21

Abstract

Equal-channel angular pressing (ECAP) treatment is a method to improve the mechanical properties of bulk metals without adding or extracting their alloy elements. The ECAP process can improve severe plastic deformation that will increase mechanical properties such as hardness and modulus of elasticity. The disadvantage of ECAP product is non-uniform mechanical properties. To solve this problem, the post-ECAP annealing process can be applied to form more uniform mechanical properties. This phenomena should also be caused by the change of crystal structure and texture during this process. However, the study of the change of crystal structure and texture during ECAP and followed by annealing process was seldom done. This study aims to try to determine the characteristics of crystal structure and texture of ECAPed and post-ECAP-annealed materials with annealing temperature variation of 0, 100, 200, and 300 oC. Four Al-5052 alloy rods were used as material samples. The results of this study show that the annealing process can homogenize the crystal structure of ECAPed Al-5052 rod. On the other hand, the texture characteristics of ECAPed Al-5052 rod become more random as an implication of increasing annealing temperature.
SINTESIS FASA ɣ-Co PADA PADUAN Co26Cr6Mo0.18N DENGAN KOMBINASI METODE HOMOGENISASI 1200 oC DAN HOT ROLLING SERTA TRANSFORMASI STRUKTUR KRISTALNYA R. Ibrahim Purawiardi; I Nyoman G. P Astawa; Fendy Rokhmanto; Ika Kartika
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 12, No 2 (2018): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

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Abstract

Co-Cr-Mo alloy is a material that widely used for bioimplant in the medical field due to its corrosion resistance and mechanical properties. Structurally, recommended Co-Cr-Mo alloys for medical applications are ɣ-Co phase which has an FCC structure. But, Co7Mo6 metastable phase often occurs after its synthesis. The formation of Co7Mo6 phase will decrease the composition of ɣ-Co phase. This study aimed to synthesize ɣ-Co phase without following the appearance of Co7Mo6 phase using a combination of 1200 oC homogenization and hot rolling followed by cooling treatment. The alloy used was Co26Cr6Mo0.18N ingot. Cooling treatments were done using the variation of cold water, water and air. The transformation of the crystal structure from the primitive cubic to the FCC occurs during water and air cooling treatments which means that ɣ-Co phase is successfully formed by those cooling treatments. However, Co7Mo6 phase is still formed on the water cooling treatment while none of  Co7Mo6occurred on the air cooling treatment. Structurally, air cooling treatment produces most stable ɣ-Co phase than the others. However, brittle ɛ-Co phase as a partial dislocation is formed after air cooling treatment due to imperfection of hot rolling treatment.
Co-Authors Fendy Rokhmanto I Nyoman G. P Astawa I Nyoman Gede Putrayasa Astawa Ika Kartika