Effect of Artificial Aging Temperature on the Hardness and Compressive Strength of Aluminum Foam

Dewi Puspitasari; Andita Nataria Fitri Ganda; Wildan Mufti Wirdana; Muhammad Mukhid Almudakir

doi:10.33474/rme.v5i1.23558

Authors

Dewi Puspitasari Universitas Negeri Surabaya
Andita Nataria Fitri Ganda Universitas Negeri Surabaya
Wildan Mufti Wirdana Universitas Negeri Surabaya
Muhammad Mukhid Almudakir Universitas Negeri Surabaya

DOI:

https://doi.org/10.33474/rme.v5i1.23558

Keywords:

Aluminium foam, Artificial aging, Kekerasan, Kekuatan tekan, Struktur mikro

Abstract

Aluminium foam merupakan material berpori yang semakin banyak digunakan dalam aplikasi struktural ringan dan penyerap energi karena memiliki rasio kekakuan terhadap berat yang tinggi serta kemampuan serap benturan yang baik. Meskipun demikian, performa mekanik Aluminium foam sangat bergantung pada perlakuan termal pasca-produksi, khususnya proses artificial aging. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi suhu perlakuan artificial aging terhadap sifat kekerasan dan kekuatan tekan busa aluminium berbasis paduan Al/Ca. Sampel busa aluminium diperoleh secara komersial dan diproses melalui gas-induced casting menggunakan agen pembusa TiH₂ untuk menghasilkan struktur pori tertutup. Perlakuan aging dilakukan pada tiga suhu berbeda, yaitu 165°C, 208°C, dan 250°C, masing-masing selama 6 jam setelah proses solution heat treatment dan quenching. Hasil uji kekerasan Vickers dan uji tekan menunjukkan bahwa suhu 165°C menghasilkan peningkatan paling signifikan, dengan kekerasan sebesar 58,4 HV dan kekuatan tekan 2,39 MPa. Sebaliknya, peningkatan suhu aging hingga 208°C dan 250°C menyebabkan penurunan sifat mekanik akibat fenomena overaging. Analisis struktur mikro mendukung hasil tersebut, di mana presipitat halus dan merata terlihat pada suhu 165°C, sedangkan pertumbuhan presipitat berlebih diamati pada suhu yang lebih tinggi. Dengan demikian, suhu aging 165°C direkomendasikan sebagai kondisi optimal untuk meningkatkan performa mekanik busa aluminium pada aplikasi struktural ringan dan penyerap energi.

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