PENGARUH PROSES LAKU PANAS TERHADAP KARAKTERISTIK TERMOMEKANIS SHAPE MEMORY ALLOYS Cu-Zn-Al

AGUNG SUGIYANTO, . (2008) PENGARUH PROSES LAKU PANAS TERHADAP KARAKTERISTIK TERMOMEKANIS SHAPE MEMORY ALLOYS Cu-Zn-Al. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Penelitian ini bertujuan untuk melihat pengaruh perbedaan media quenching terhadap karakteristik shape memory alloys dan untuk melihat struktur mikro yang terbentuk pada masing-masing spesimen setelah proses perlakuan panas dengan menggunakan media quench air 270C, air garam 10% 270C, dan air es 100C. Metode penelitian ini adalah penelitian eksperimen dengan analisa laboraturium. Penelitian ini dilakukan di LIPI-Metalurgi Puspitek Serpong Tangerang, Laboraturium Material Teknik Mesin UNJ, dan Laboraturium LUK BPPT Puspitek Serpong Tangerang. Pada penelitian ini bahan yang digunakan yaitu tembaga, seng, dan aluminium murni dengan komposisi kimia target sebesar Cu25,35Zn4,1Al. Proses yang dilakukan dalam pembuatan shape memory alloys (SMA) yaitu proses peleburan dan pemaduan, homogenisasi pada temperatur 8500C, pengerolan panas pada temperatur 6500C dengan reduksi 25%-30%, pengerolan dingin pada temperatur 6500C dengan reduksi 5%-7%, proses perlakuan panas dengan pemanasan pada temperatur 8500C, diikuti dengan pendinginan cepat pada media air 270C, air garam 10% 270C, dan air es 100C. Pada analisis akan diuji yaitu komposisi kimia, metalografi, uji kekerasan, dan temperatur transformasinya. Komposisi kimia paduan adalah 70,9821Cu-24,97Zn-3,93Al. Pada struktur mikro spesimen hasil pengecoran, fasa yang terbentuk fasa α sel satuan FCC dengan persentase jumlah 43,57% dan fasa β sel satuan BCC dengan persentase jumlah 56,43%. Dengan mempercepat laju pendinginan yaitu menggunakan media air garam 10% 270C dan media air es 100C terhadap media air 270C. Pada struktur mikro hasil perlakuan panas, fasa yang terbentuk yaitu fasa martensit dengan sel satuan HCP dan fasa austenit dengan sel satuan BCC dengan persentase jumlah fasa pada spesimen hasil quenching media air garam 10% 270C fasa martensit 46,15% dan fasa austenit 58,85%, harga kekerasan 136VHN, temperatur As 180C dan temperatur Af 310C. Pada spesimen hasil quenching media air es 100C fasa martensit 18,75% dan fasa austenit 81,25%, harga kekerasan 130VHN, dan temperatur As 120C dan temperatur Af 280C. Pada spesimen hasil quenching media air 270C fasa martensit 26,67% dan fasa austenit 73,33%, harga kekerasan 133 VHN, temperatur As 140C dan temperatur Af 290C. Pada SMA 70,9821Cu-24,97Zn-3,93Al, penurunan temperatur As dan temperatur Af pada spesimen hasil quenching dengan media air es 100C diakibatkan oleh volume dari media quenching air es 100C setengah dari media quenching air 270C, sehingga temperatur dari media quenching air es 100C telah berubah ketika spesimen dilakukan proses quenching. ***** This research aim to see difference influence of media quenching to characteristic shape memory alloys and see microstructure formed at each specimen after done heat treatment process by using media quench water 270C, brine 10% 270C, and ice water 100C. This research method is research of experiment with analysis laboratory. This research done in LIPI-METALURGI Puspitek Serpong Tangerang, Laboratory Material Teknik Mesin UNJ, and Laboratory LUK BPPT Puspitek Serpong Tangerang. At this research material applied that is pure copper, pure zinc, and pure aluminum with chemical composition target of equal to Cu25,35Zn4,1Al. Process performed within making of shape memory alloys ( SMA) that is fusion process and alloy, homogenizing at temperature 8500C, hot rolling at temperature 6500C with reduction 25%-30%, cold rolling at temperature 6500C with reduction 5%-7%, heat treatment process with heating at temperature 8500C, followed with quick cooling at water media 270C, brine 10% 270C, and ice water 100C. At analysis will be tested that is chemical composition, metallographic, hardness test, and transformation temperature. At this research chemical composition of alloy is 70,9821Cu-24,97Zn-3,93Al. At specimen microstructure result of casting, phase formed by phase α cell unit FCC with percentage number of 43,57% and phase β cell unit BCC with percentage number of 56,43%. By quickening cooling rate that is using brine media 10% 270C and ice water media 100C to water media 270C. At microstructure result of heat treatment, phase formed that is martensite phase with cell unit HCP and austenite phase with cell unit BCC with percentage number of phases at specimen result of quenching brine media 10% 270C martensite phase 46,15% and austenite phase 58,85%, the price of hardness 136VHN, temperature As 180C and temperature Af 310C. At specimen result of quenching ice water media 100C martensite phase 18,75% and austenite phase 81,25%, the price of hardness 130VHN, and temperature As 120C and temperature Af 280C. At specimen result of quenching water media 270C martensite phase 26,67% and austenite phase 73,33%, the price of hardness of 133 VHN, temperature As 140C and temperature Af 290C. At SMA 70,9821Cu-24,97Zn-3,93Al, derivation of temperature As and temperature Af at specimen result of quenching with ice water media 100C resulted from volume from media quenching ice water 100C semi from media quenching water 270C, so that temperature from media quenching ice water 100C has changed when specimen is done process quenching.

Item Type: Thesis (Sarjana)
Additional Information: 1). DRS. AKHMAD SAUFAN, MT. ; 2). IR. BINTANG ADJIANTORO, MT.
Subjects: Teknologi dan Ilmu Terapan > Teknik Mesin, Mekanika Teknik
Divisions: FT > D III Teknik Mesin
Depositing User: PKL .
Date Deposited: 22 Oct 2026 07:12
Last Modified: 22 Oct 2026 07:12
URI: http://repository.unj.ac.id/id/eprint/74495

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