Ni、Fe合金化及时效时间对锰铜基阻尼合金相变行为的影响

使用真空感应炉制备了Mn-20Cu、Mn-20Cu-5Ni、Mn-20Cu-5Ni-2Fe三种不同成分梯度的合金,利用动态机械分析仪测量了弹性模量及内耗与温度之间的关系,以研究化学成分及时效时间对合金反铁磁转变及马氏体相变的影响。结果表明,合金的相变特征温度和时效时间的平方根正相关,添加的合金元素通过影响调幅分解过程中溶质原子的扩散从而对特征温度发生作用,描述振荡应力和相界面之间耦合强度的l值是反映阻尼合金材料的关键因素之一。

Effect of alloying of nickel and iron and aging time on phase transformation behaviour of MnCu based damping alloy

Three alloys with different composition gradients of Mn-20Cu, Mn-20Cu-5Ni and Mn-20Cu-5Ni-2Fe were prepared, the relationships between elastic modulus and internal friction versus temperature were measured by using a dynamic mechanical analyzer to investigate the effects of chemical composition and aging time on antiferromagnetic transformation and martensitic transformation of the alloys. The results show that the characteristic phase transformation temperature of the three alloys is positively correlated with the square root of the aging time, the alloying elements act on the characteristic temperature by influencing the diffusion of solute atoms during spinodal decomposition and that the l-value describing the coupling strength between applied oscillating stress and phase interface is one of the key factors reflecting the damping alloy material.