《Table 2:Mechanical properties of Fe83Ga17Dyx(x=0,0.05,0.1,0.2,0.4)alloys at room temperature》

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《Effect of Dy doping on magnetostrictive and mechanical properties of Fe_(83)Ga_(17) alloy》

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Surprisingly，the fracture mode continues to change，as the Dy content continues to increase.From Fig.6（d），it can be seen that the fracture morphology of the x=0.2 alloy appears as dimple fracture，which is a typical ductile fracture.In addition，a large number of slip bands of plastic deformation are also observed with x=0.2，as shown in the inset of Fig.6（d）.Therefore，the tensile ductility of x=0.2 alloy was significantly improved with the fracture strain of 11.03±0.21%.For the x=0.4 alloy，the similar dimple structure with the smaller size（～3μm）can also be observed in Fig.6（e），and excellent ductility is thus obtained with the fracture strain of 9.94±0.04%，close to that of x=0.2alloy.Overall，the enhancement in ductility of the x=0.2 and 0.4alloys is due to the appearance of the dimple structure，which is associated with a large number of precipitations of the Dy-rich phase.This dimple fracture inducing a significant enhancement in ductility has been found in the previous work[12，41].It is well known that the significant improvement in ductility may generally sacrifice the strength of the material in different extents.So the ultimate tensile strengths of the Fe83Ga17Dyx（0.2≤x≤0.4）alloys are also reduced.From the above analysis，it can be concluded that fracture mode changes from intergranular fracture to transgranular cleavage and subsequently to dimple fracture with the increase of Dy addition.This transformation of the fracture mode was considered to be the reason for the evolution of mechanical behavior.