PhD candidate Nguyen Duy Trinh successfully defended the university-level doctoral dissertation

On the afternoon of October 24th, 2025, at the School of Mechanical and Automotive Engineering (SMAE), PhD candidate Nguyen Duy Trinh successfully defended his university-level doctoral dissertation in Mechanical Engineering. The defense attracted the attention of numerous scientists, lecturers, and PhD candidates from both inside and outside the university.

Under the supervision of Assoc. Prof. Dr. Hoang Tien Dung - SMAE’s Rector, PhD candidate Nguyen Duy Trinh conducted the dissertation titled: “Research on improving surface quality in magnetic polishing of Ti-6Al-4V alloy.” This is a highly applicable research direction, which aims to improve machining efficiency and product quality in industries requiring high precision, such as aerospace, medical technology, and national defense.

Overview of PhD candidate Nguyen Duy Trinh’s doctoral dissertation defense, SMAE

The dissertation assessment council included:

Assoc. Prof. Dr. Tran Duc Quy – Hanoi University of Industry –Chairman of the Council

Assoc. Prof. Dr. Nguyen Huu Phan – Hanoi University of Industry – Secretary Member

Prof. Dr. Nguyen Duc Toan - Hanoi University of Science and Technology - Reviewer 1

Assoc. Prof. Dr. Nguyen Trung Thanh – Military Technical Academy – Reviewer 2

Assoc. Prof. Dr. Nguyen Tuan Linh – Hanoi University of Industry – Reviewer 3

Assoc. Prof. Dr. Tran Ngoc Hien – University of Transport and Communications – Member

Assoc. Prof. Dr. Nguyen Quoc Tuan - Thai Nguyen University of Technology - Member

Ti-6Al-4V alloy is a strategic material with superior mechanical properties; however, its finishing process poses numerous technical challenges. The dissertation developed a novel magnetic polishing method (MRF), incorporating an improved Halbach magnetic array configuration to enhance polishing force, increase material removal efficiency, and achieve nanometer-level surface roughness. Simultaneously, the study formulated an environmentally friendly polishing solution using green components such as Fe₃O₄, SiO₂, H₂O₂, and malic acid. This contributes to minimizing health and environmental impacts, aligning with sustainable manufacturing trend. Furthermore, the mathematical model developed in the dissertation allows for the accurate prediction of polishing performance, supporting process optimization and opening up potential for widespread application in high-tech sectors.

The presentation of PhD candidate Nguyen Duy Trinh at the university-level doctoral dissertation Defense Council

At the defense, PhD candidate Nguyen Duy Trinh received profound professional critiques and constructive suggestions from the Council to further refine the dissertation. The overall assessment recognized the dissertation as a testament to the candidate's serious and in-depth research process, demonstrating high scientific value and outstanding practical applicability.

The speech of Assoc. Prof. Dr. Tran Duc Quy from SMAE, Chairman of the Council

The speech of Assoc. Prof. Dr. Hoang Tien Dung - SMAE’s Rector - Supervisor of PhD Candidate Nguyen Duy Trinh

According to the overall assessment of the council members, the dissertation is a testament to the serious and in-depth research process of the PhD student. The results achieved demonstrate high scientific value and outstanding practical application, meeting all the criteria of a PhD dissertation.The Evaluation Council highly appreciated the dissertation with 5/7 excellent evaluation votes, and proposed that Hanoi University of Industry recognizes the degree and grants a PhD degree to PhD candidate Nguyen Duy Trinh.

The congratulations of The Dissertation Evaluation Council on PhD Candidate Nguyen Duy Trinh on completing the university-level doctoral dissertation

The congratulation of Assoc. Prof. Dr. Hoang Tien Dung - SMAE’s Rector, along with staff and lecturers on the new PhD. Nguyen Duy Trinh

Some images from the university-level doctoral dissertation defense of PhD candidate Nguyen Duy Trinh: