Sida Liu

 Laboratory for multiscale mechanics and medical science, SV LAB, School of Aerospace,

Xi'an Jiaotong University, Xi'an 710049, China; 

EXTENDED ABSTRACT: Due to the low solid solubility of Mn and the limited quantity of Mn precipitates, A-Mn alloys exhibit poor ageardening resonse,wit much smaller hardening increment compared to commonly aged-strengthened aluminum alloys. In recent yearsvarious chemical elements have been introduced into Al-Mn alloys, mostly Zr, ScSn Mo, etc., for improving the mechanical properties ofthe alloy by regulafing the precipitation eficiency of the alloy phases or forming dispersed nano-precipitation phases, with the purpose oimproving the heat treatment strengthening of A-Mn alloys.Nevertheless. the improvement potential of the compositional controlmethodis gradually limited, leading to the inevitable choice of developing a completely new system for high-strength and tough Al-Min alloysAdditionally, a significant amount of researchhas focused on the development of alloy processing techniques, such as twin-roll castingand severe plastic deformation.to regulate the microstructure of Al-Mn allovs and achieve alloy strengthening. However. the eftectivenesof these techniques has been limited. Studies have found that by utilizing physical vapor deposition methodspossible to combinecrystalline and amorphous phases. resulting in the productionof composite-structured alloys that exhibit superior yield strength and uniform*uctlity, it has been reported that hign-trength and tough Al-based multicomponent alloys with a "crystallme-amorphous" nano-dual thaserStricture can be prepared using magneron sputtering techniques. it can be anticipated that by adding trace elements X (X = Ru or Pd) to AlMn binary alloys and ufilizing the advantages of the nano-dual phase structure. a novel "crystalline-amorphous" nano-dual phase Al-Mn-Xternary alloy can be developed, which will play a signifcant role in enhancing the mechanical properties of the alloyDuring the process of alloy material fabricationusing magnetron sputtering, the system deviates from equilibrium and easily obtainsmetastable phases. By combining computational method.s such as CALPHADwith experimental techniques, a phase diagram of metastabltphases can be constructed for the system, allowing for the investigation of the infuence of chemical composition and fabrication processeon material stricture, and subsequently evaluating the performance of materials uder different structhures. For instance, a ternary aluminumbased metastable phase diagrambased on CALPHAD and key experiments is used to describe the phase formation behavior0007914t241of commonly used hard coating material Al-Ti-N in industrial production. Similarly, the construction of a thermodynamic database foithe Al-Mn-X system facilitates the understanding of the influence of chemical composition on phase formation in the alloy, therebyproviding theoretical guidance for the development of high-strength and tough Al-Mn-based nano-dual phase alloys. This proiect envision:expanding existing research methods by integrating theoretical calculafions, experimental fabrication, electrochemical testing, and advancedcharacterization techniques to eficiently establish the correlation beween composition, structure, and mechanical properties in the A-Mnsystem, ultimately leading to the fabrication of high-strength and tough A1-Mn-X allovs.

Keywords:magnetron sputtering:nano-dual phase: metastable state: thermodynamic calculation