Abstract: The changing process of the microstructure of ZMnD-1J Mn-Cu damping alloy during aging was studied by the analyzing of transmission electron microstructure and diffraction patterns. And then, the relationships between the transformation of the alloy microstructure and its damping property were investigated. The results show that, during aging the transformation of the alloy microstructure consists of three stages, including the form of mottled substructure during primary aging, the forms of microtwinning and stable phase α-Mn. Compared the former microstructure in aging with the latter microstructure in aging, the most obvious different is that the latter produces microtwinning. Damping property increases in direct ratio with the quantity of twin. When the density of twin reaches maximum, damping property is also maximum. Prolonging with period of damping, the quantity of α-Mn increases, the quantity of twin decreases, the damping property decreases.
Aging microstructure of ZMnD-1J Mn-Cu damping alloy
Abstract：
The changing process of the microstructure of ZMnD1J MnCu damping alloy during aging was studied by the analyzing of transmission electron microstructure and diffraction patterns. And then, the relationships between the transformation of the alloy microstructure and its damping property were investigated. The results show that, during aging the transformation of the alloy microstructure consists of three stages, including the form of mottled substructure during primary aging, the forms of microtwinning and stable phase αMn. Compared the former microstructure in aging with the latter microstructure in aging, the most obvious different is that the latter produces microtwinning. Damping property increases in direct ratio with the quantity of twin. When the density of twin reaches maximum, damping property is also maximum. Prolonging with period of damping, the quantity of αMn increases, the quantity of twin decreases, the damping property decreases.
Fig.2 TEM photographs of mottled substructure during primary aging (a)—Aging for 0.5 h; (b)—Aging for 1 h; (c)—Diffraction pattern of mottled substructure
Fig.3 TEM photographs of alloy aged for 2h (a)—Microstructure of appearing great deal of interface; (b)—Diffraction pattern of interface; (c)—Germinant twin; (d)—Germinant twin coexisting with microtwinning
图4 内耗Q-1与时效时间t的关系
Fig.4 Relation between internal energy loss(Q-1) and aging time(t)
Fig.5 TEM photographs of stable phase α-Mn of alloy aged for 6 h (a)—Stable phase inside grain; (b)—Diffraction pattern of stable phase inside grain; (c)—Energy spectrum of stable phase inside grain; (d)—Diffraction pattern after demarcating
图6 时效6 h微细孪晶的TEM照片
Fig.6 TEM photograph of microtwinning of alloy aged for 6 h
