The effects of pre-strain on the continuous precipitation (CP) and discontinuous precipitation (DP) as well as mechanical properties of L1₂-strengthened HEAs were thoroughly studied. It is found that the pre-strain has a dual effect on the L1₂ precipitation behavior depending on the pre-strain level. At low pre-strains, the plastic deformation increases the dislocation density without significantly affecting the grain structure, which accelerates the CP reaction by promoting the CP nucleation and growth, leading to the CP-dominant microstructure. At high pre-strains, the server plastic deformation induces the formation of a high density of deformation bands and subgrains, the boundaries of which provide preferred nucleation sites for the DP reaction. In addition, the high stored energy induced by the cold deformation enhances the grain boundary migration, which promotes the DP growth and concurrent recrystallization. Mechanical tests further reveal that the pre-strain substantially improves the strength of the alloys without significantly deteriorating the ductility. The contributions of dislocations, grain boundaries, and precipitates to the strengthening of the pre-strained and aged alloys were quantitatively evaluated.

_{深入研究了预应变对L1 2}强化HEA的连续沉淀(CP)和不连续沉淀(DP)以及力学性能的影响。发现预应变对 L1 _{2有双重影响}沉淀行为取决于预应变水平。在低预应变下，塑性变形增加了位错密度而不显着影响晶粒结构，通过促进 CP 形核和生长来加速 CP 反应，导致以 CP 为主的微观结构。在高预应变下，服务器塑性变形导致高密度变形带和亚晶粒的形成，其边界为 DP 反应提供了优选的成核位置。此外，冷变形引起的高储能增强了晶界迁移，促进了DP生长和同时再结晶。机械测试进一步表明，预应变显着提高了合金的强度，而不会显着降低延展性。