This volume collects papers presented at the 4th International Conference on Material Engineering Research (4th ICMER 2021, Incheon, South Korea, May 14-16, 2021) and at the 6th International Conference on Applied Engineering, Materials and Mechanics (6th ICAEMM 2021) which was held online in Kuala Lumpur, Malaysia, during April 16-18, 2021. The collection of papers dedicates to research in applied materials and advanced materials processing technologies.