Putera, Sulaeman Danisara Mulya (2024) PENGARUH PENAMBAHAN KERAMIK ZrO2 DAN WAKTU AGING TERHADAP SIFAT MEKANIK, SIFAT PERMUKAAN DAN KARAKTERISASI Mg-1Zn-2,9Y/ZrO2 MELALUI PROSES ARGON ATMOSPHERE SINTERING. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
Paduan Mg1Zn2,9Y (wt%) merupakan paduan magnesium yang saat ini tengah banyak dikembangkan. Proses pembuatan material ini dapat dilakukan melalui teknik metalurgi serbuk. Namun, salah satu kekurangan dari material ini adalah sifat mekaniknya yang cenderung rendah apabila dibandingkan dengan logam ringan lainnya seperti aluminium dan stainless steel. Terdapat beberapa cara yang dapat dilakukan untuk meningkatkan sifat mekanik dari paduan ini, yaitu melalui proses perlakuan panas berupa artificial aging dan proses manufaktur paduan komposit dengan melakukan adisi serbuk biokeramik ZrO dengan kompaksi serbuk bertekanan 400MPa dan dilanjutkan dengan proses sintering di suhu 500oC selama 3 jam, dan dilanjutkan dengan homogenisasi di suhu 200oC selama 1 jam. Sesudah itu, dilanjutkan proses annealing di suhu 400oC selama 6 jam dan proses artificial aging selama variasi waktu 6; 12; dan 18 jam. Dari variasi waktu aging selama 6; 12; dan 18 jam, serta variasi fraksi berat ZrO2 sebanyak 0; 1,2; dan 2%, didapatkan hasil berupa penghalusan butir hingga 3,1% dari nilai 0% ZrO2. Namun, waktu aging selama 12 jam menghasilkan peningkatan sebesar 5,1% dari kondisi awal spesimen. Merujuk kepada sifat permukaan, didapatkan hasil bahwa material cenderung makin bersifat hidrofilik seiring dengan meningkatnya waktu aging dan adisi ZrO2 dari nilai 67o menjadi 51o. Proses variasi ini juga menghasilkan pengaruh kepada struktur mikro yang dimana mengalami reduksi ukuran dari 159μm menjadi 153,67µm setelah ditambahkan biokeramik dan peningkatan ukuran dari 159μm menjadi 168,16μm setelah variasi waktu aging. Hal ini memiliki keterkaitan dengan adanya perubahan fasa yang terjadi seperti terbentuknya fasa MgZnY, dan pembentukan fasa ZrO2. Hasil analisa kekuatan material menandakan bahwa keramik serta waktu aging berpengaruh terhadap peningkatan nilai UCS hingga 259 MPa pada 1,2%- 12 Jam, nilai elongasi menjadi 47,77%, dan nilai Modulus elastisitas menjadi 1888,293 MPa. Kata Kunci: Paduan Magnesium, WZ21, Komposit Mg, Perlakuan Panas, Sifat Mekanik, Sifat Permukaan, Karakterisasi
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | The Mg1Zn2.9Y (wt%) alloy is a magnesium alloy that is currently being developed a lot. The process of making this material can be done using powder metallurgy techniques. However, one of the disadvantages of this material is that its mechanical properties tend to be low when compared to other light metals such as aluminum and stainless steel. There are several ways that can be done to improve the mechanical properties of this alloy, namely through a heat treatment process in the form of artificial aging and a composite alloy manufacturing process by adding ZrO bioceramic powder with powder compaction at a pressure of 400MPa and followed by a sintering process at a temperature of 500℃ for 3 hours. and continued with homogenization at 200℃ for 1 hour. After that, the annealing process continued at 400℃ for 6 hours and the artificial aging process for 6 time variations; 12; and 18 hours. From variations in aging time for 6; 12; and 18 hours, as well as variations in the ZrO2 weight fraction of 0; 1.2; and 2%, results obtained in the form of grain refinement of up to 3.1% from the value of 0% ZrO2. However, an aging time of 12 hours resulted in an increase of 5.1% from the initial condition of the specimen. Referring to the surface properties, the results showed that the material tends to become more hydrophilic as the aging time and ZrO2 addition increase from a value of 67o to 51o. This variation process also had an effect on the microstructure, which experienced a reduction in size from 159μm to 153.67μm after adding bioceramics and an increase in size from 159μm to 168.16μm after varying the aging time. This is related to the phase changes that occur, such as the formation of the MgZnY phase and the formation of the ZrO2 phase. The results of the material strength analysis indicate that ceramics and aging time influence the increase in the UCS value up to 259 MPa at 1.2% - 12 hours, the elongation value becomes 47.77%, and the modulus of elasticity value becomes 1888.293 MPa. Keywords: Magnesium Alloy, WZ21, Mg Composite, Heat Treatment, Mechanical Properties, Surface Properties, Characterization | |||||||||
| Subjects: | T Technology > T Technology (General) T Technology > TN Mining engineering. Metallurgy T Technology > TP Chemical technology T Technology > TS Manufactures |
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| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mr Sulaeman Daniswara Mulya Putera | |||||||||
| Date Deposited: | 25 Mar 2024 11:01 | |||||||||
| Last Modified: | 25 Mar 2024 11:01 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/34477 |
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