Influence of Y2O3 content on characteristics of 7075 aluminium matrix B4C-Y2O3 reinforced composites
Ceramics International, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.ceramint.2026.08.055
- Dergi Adı: Ceramics International
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Composites (B), Hot pressing (A), Wear resistance (C), Y2O3(D)
- Yıldız Teknik Üniversitesi Adresli: Evet
Özet
The study investigated the effect of Y2O3 content on the formation of the in-situ phases and their effects on the properties of 7075 aluminium matrix B4C-Y2O3 reinforced composites. The composites were fabricated by the hot pressing process using a fixed B4C content of 5 wt% together with 1, 3, 5 wt% Y2O3 additions. The hot pressing was performed at 450 °C for 30 min under 200 MPa pressing pressure. The microstructural properties and formation of the in-situ phases were investigated with XRD, SEM, EDS and EBSD analyses. Moreover, Archimedes density measurements, hardness and wear tests were conducted to investigate the characteristics of the samples. Microstructural analyses showed that the presence of Y2O3 promoted the segregation of magnesium and copper elements in the matrix. No in-situ phase formation was observed in the 7075-B4C and 7075-B4C-1 wt% Y2O3 composites. In contrast, increasing Y2O3 content promoted in-situ phase formation accompanied by magnesium and copper segregation. Aluminium-magnesium-oxygen based complex oxide and aluminium-copper-yttrium based intermetallic structure were identified in the 7075-B4C-3 wt% Y2O3 and 7075-B4C-5 wt% Y2O3 composites. After the aging treatment, the hardness of the 7075-B4C composite increased to 198 HV. In contrast, the hardness of the 7075-B4C-5 wt% Y2O3 composite decreased to 147 HV, which can be attributed to magnesium segregation induced by the addition of Y2O3. Despite the lower hardness of composites, the wear rate of the 7075 alloy was improved from 9.15·10−4 mm3/Nm to 1.84·10−4 mm3/Nm owing to presence of Y2O3 and Al2MgO4 and Al-Cu-Y based in-situ phases.