Powder Metallurgical Fabrication and Microstructural Investigations of Aluminum/Steel Functionally Graded Material

Abstract

Aluminum/steel electric transition joints (ETJs) are used in aluminum reduction cell for the purpose of welding aluminum rod and steel bracket components. Solid state welding process used for joining aluminum and steel at the electric transition joints have the drawbacks of cracking and separation at the interface surfaces. Cracking and separation at the electric transition joints are caused by the stress singularities that developed due to the mismatch in thermal and mechanical properties of each material. To overcome the drawback of electric transition joints, aluminum/steel functionally graded may be used as electric transition joints or proposed. Therefore manufacturing and investigation of aluminum/steel functionally graded materials fabricated by powder metallurgy process were carried out through the current work. Different samples with different layers of aluminum/steel functionally graded materials were compacted using steel die and punch at the same compacted pressure and sintered temperature. After investigating the different samples of aluminum/steel functionally graded materials under different fabrication conditions, the suitable fabrication regime was determined with the aid of microscopic observations

Sıcak Presleme Yöntemiyle Üretilmiş B4C Takviyeli AA 7xxx Matrisli Fonksiyonel Derecelendirilmiş Malzemelerin Çapraz Kırılma Dayanımının Belirlenmesi

“…Bir diğer adımda ise karışım tozları önceden şekli belirlenmiş kalıp içerisine uygun şekilde dağıtma ve devamında istifleme-sıkıştırma bulunmaktadır. İmalatın son safhasında ise tam yoğunluğa ulaşmak için sinterleme yapılmaktadır [4,7,8].…”

A brief review of functionally graded materials

“…Powder metallurgy (PM) is commonly utilized in the industry in order to deliver practically graded material [1] via the following three (3) steps: (i) weighing and blending of powder as indicated by the pre-composed spatial distribution as dictated by the functional prerequisite, (ii) stacking and ramming of the premixed-powders, (iii) sintering. In short, the PM strategy gives ascend to a stage wiser structure.…”

Characterization of Microscale Drilling Process for Functionally Graded M2-Cu Material Using Design of Experiments

“…Nemat-Alla 등 [8] 은 분말야금법을 사용하여 FGM 제조 공정을 단순화하고자 하였으 며, 그 미세구조 분석을 통하여 기공이나 크랙이 없는 FGM을 생 산할 수 있음을 보였다. 이와 같이 현재까지 FGM 관련 연구는 주로 FGM 제조 방법이 나 열응력, 열전도, 굽힘응력 등 물성 분석에 관한 연구에 집중되어 [12] .…”