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Journal : Transmisi

Analisis Sifat Mekanik dan Sifat Fisik Paduan Aluminium pada Perlakuan Penuaan Buatan Dewi Izzatus Tsamroh; Muhammad Ilman Nur Sasongko; Cepi Yazirin
TRANSMISI Vol 18, No 1 (2022): March 2022
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v18i1.8056

Abstract

The most widely used aluminum alloy in industry is Al2024 alloy. Aluminum alloys used for automotive components are required to have good strength. The purpose of this study was to analyze the distribution of precipitates, morphology and hardness of Al2024 alloy due to artificial aging in stages I, II, and III. The test results showed that the highest distribution of precipitates (CuAl2) was in Al2024 with the third-stage artificial aging variation, and the least distribution was in the I-stage artificial aging variation. The results of morphological observations on Al2024 due to multilevel artificial aging treatment using SEM, the microstructure of Al2024 was relatively the same. (homogeneous) at each level variation. The stratified artificial aging treatment on Al2024 causes the particle size at each level variation to be smaller with closer distances. Meanwhile, the hardness value of Al2024 increased. The highest hardness of Al2024 is in the specimen with the third stage of artificial aging treatment, which is 79.66 HRE, the lowest hardness is the first stage of artificial aging, which is 74.33 HRE. 
Karakteristik Nanopowder Manganese Oxide (MnO) Hasil Sintesis Sol-Gel Sasongko, Muhammad Ilman Nur
TRANSMISI Vol 18, No 1 (2022): March 2022
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v18i1.8122

Abstract

Phase and morphology characterization of powder Manganese Oxide (MnO) aims to reduce the grain size of micro sized MnO material into nano size using sol-gel method with sintering time variations. The results showed the phase changes in the MnO 30 minutes, 60 minutes and 90 minutes indicates the size of the crystal grains of 47,3.nm, 68.299 nm, and 84, 547 nm. (2) The change is significant, because the crystals MnO Raw at 143.44 nm. (3) Changes in the morphology shows a triangular Raw MnO after synthesis, transformed into spherical grains by agglomeration membranes MnO. The study has managed to change the grain size of micro sized MnO into nano.