Pengaruh Waktu Artificial Aging terhadap Struktur Kristal Kerapatan Dislokasi dan Kekerasan pada Paduan Al-7075 = Effect of Artificial Aging Time on Crystal Structure, Dislocation Dens And Hardness of Al-7075 Alloy

Putri, Dian Permata and Siswanto, Budiarto Djono and Hutauruk, Dikky Antonius (2020) Pengaruh Waktu Artificial Aging terhadap Struktur Kristal Kerapatan Dislokasi dan Kekerasan pada Paduan Al-7075 = Effect of Artificial Aging Time on Crystal Structure, Dislocation Dens And Hardness of Al-7075 Alloy. JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY, 4 (2). pp. 1114-128. ISSN 2549-6239

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Abstract

Penelitian sintesis paduan Aluminium (7075) dengan metode metalurgi butiran dan proses T6. Data pengaruh waktu artificial aging terhadap struktur kristal, ukuran kristal, kerapatan dislokasi, regangan kisi, dan kekerasan dengan proses solid solution pada suhu 550 oC selama 1 jam, didinginkan hingga mencapai suhu ruang menggunakan udara bebas dan selanjutnya proses artificial aging dengan holding time 1, 24 dan 30 jam pada suhu 200 oC. Setelah itu didinginkan hingga mencapai suhu ruang menggunakan udara bebas. Kekerasan paduan aluminium 7075 tanpa perlakuan panas sebesar 20,118 HBN dan mencapai kekerasan maksimum pada holding time 1 jam sebesar 23,035 HBN, karena terbentuk presipitat (endapan) Mg2Si dan MgZn2. Ukuran kristal terbesar dan terkecil pada bidang indeks Miller (2 0 0), dengan holding time 30 dan 24 jam sebesar 23,94550 nm dan 3,4405 nm. Densitas dislokasi terbesar dan terkecil pada bidang indeks Miller (2 0 0), dengan holding time 24 dan 30 jam sebesar 0,08448 garis/mm2 dan 0,00174 garis/mm2. Regangan kisi mikro terendah dan terbesar bidang indeks Miller (3 1 1) holding time 30 jam yaitu 3,78% dan bidang indeks Miller (1 1 1) holding time 24 jam yaitu 27,9%. Kata Kunci: Paduan Al 7075, metalurgi butiran, XRD, T6, artificial aging / Research synthesis of Aluminum alloy (7075) with metallurgical methods of granules and T6 processes. Data on the effect of artificial aging time on crystal structure, crystal size, dislocation density, lattice strain, and hardness with solid solution process at 550 oC for 1 hour, cooled to reach room temperature using free air and then artificial aging process with holding time of 1, 24 and 30 hours at 200 oC.After that it is cooled until it reaches room temperature using free air.Aluminum alloy hardness 7075 without heat treatment amounted to 20,118 HBN and achieved maximum hardness at a holding time of 1 hour of 23,035 HBN, due to the formation of presipitat (sediment) Mg2Si and MgZn2.The largest and smallest crystal size in the Miller index field (2 0 0), with a holding time of 30 and 24 hours of 23.94550 nm and 3.4405 nm. The largest and smallest dislocation density in the Miller index field (2 0 0), with a holding time of 24 and 30 hours of 0.08448 lines/mm2 and 0.00174 lines/mm2.The lowest and largest micro lattice strain of the Miller index (3 1 1) holding time of 30 hours is 3.78% and miller index field (1 1 1) holding time 24 hours is 27.9 %. Keywords: Al 7075 alloy, powder metallurgy, XRD, T6, artificial aging

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