Taguchi Based Gray Relational Analysis of Production Parameters of Al7075/B4C/GNP's Hybrid Composites

Abstract

In this study, metal matrix hybrid composites obtained by adding B4C and graphene nanoplatelets (GNPs) powders as reinforcement elements to Al7075 powders were produced by powder metallurgy (P/M) method. Mixture powders prepared by supplementing Al7075 powders with different weight ratios of B4C (2-5-10%) and GNPs (0.5%) are compressed at room temperature and at different pressing pressures (600-700-800 MPa) and then at different temperatures (500-550- 600C) was sintered in vacuum atmosphere and samples were produced in accordance with ASTM G99 standard. Density and hardness analyzes were carried out depending on the changing production parameters of hybrid composites. It was determined that the pressing pressure had a direct effect on the condensation rate of the samples and the highest density value was 2.6764 g/cm3 in the Al7075+5% B4C+0.5% GNPs sample pressed under 800MPa pressure. The hardness of the samples, on the other hand, generally increased due to the increasing amount of reinforcement element, while it also increased with the increase of pressing pressure and sintering temperature.

Keywords

• Al7075 hybrid composite
• graphene
• powder metallurgy
• taguchi
• characterization

Al7075/B4C/GNP's Hibrit Kompozitlerin Üretim Parametrelerinin Taguchi Tabanlı Gri İlişkisel Analizi

Öz

Bu çalışmada Al7075 tozlarına takviye elemanı olarak B4C ve grafen nanoplatelets (GNPs) tozları beraber katılarak elde edilen metal matriksli hibrit kompozitler toz metalürjisi (T/M) yöntemiyle üretilmiştir. Al7075 tozlarına farklı ağırlık oranlarında B4C (%2-5-10) ve GNPs (%0,5) takviye edilerek hazırlanan karışım tozları oda sıcaklığında ve farklı presleme basınçlarında (600-700-800 MPa) sıkıştırıldıktan sonra farklı sıcaklıklarda (500-550-600C) vakum atmosferinde sinterlenerek ASTM G99 standartına uygun numuneler üretilmiştir. Hibrit kompozitlerin değişen üretim parametrelerine bağlı olarak yoğunluk, sertlik analizleri gerçekleştirilmiştir. Numunelerin yoğunlaşma oranı üzerine presleme basıncının doğrudan etkili olduğu ve en yüksek yoğunluk değeri 2,6764 g/cm3 ile 800MPa basınç altında preslenen Al7075+%5 B4C+%0,5 GNPs numunesinde belirlenmiştir. Numunelerin sertliği ise genel olarak artan takviye elemanı miktarına bağlı artarken presleme basıncı ve sinterleme sıcaklığının artması ile de artış göstermiştir.

Anahtar Kelimeler

• Al7075 hibrit kompozit
• grafen
• toz metalürjisi
• taguchi
• karakterizasyon

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