The effect of rare earth doping on the mechanical properties and microstructure evolution mechanism of additively manufactured titanium alloys
ZHANG Yunlong
LIU Debao
SUN Pengfei
WANG Zhaobin
WANG Weie
REN Xiaoxue
LI Chenghai
ZHAI Ziyu
LI Haitao
Abstract：Rare earth elements(REEs)demonstrate significant potential in tailoring microstructures and improving the mechanical properties of titanium alloys produced by additive manufacturing(AM).Appro-priate addition of REEs in raw materials presents a novel approach to enhance the microstructure and me-chanical properties of AM titanium alloys.This review investigates the mechanisms and performance effects of yttrium,lanthanum,cerium,and erbium REEs in current mainstream AM methods.The effects of rare earth content additions on material strength,hardness,and wear resistance are summarized.Ex-cessive additions induce more brittle phases,segregation,and porosity defects,leading to reduced plastici-ty.Rare earth doping offers a viable pathway for high-performance AM titanium alloys,but requires bal-ancing rare earth composition,process parameters,and thermal history to achieve synergistic optimization of strength,plasticity,and stability.
Keywords：rare earth elementsadditive manufacturingtitanium alloysmicrostructuremechanical properties
Publication Date：2026-06-25
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：13( 425-437 )