Zn-Al共析合金的黏滞流变行为  

VISCOUS FLOW BEHAVIOUR OF Zn Al EUTECTOID ALLOY

作　　者：水嘉鹏[1] 陈秀梅[1] 

机构地区：[1]中国科学院固体物理研究所内耗与固体缺陷开放研究实验室

出　　处：《物理学报》1997年第9期1782-1787,共6页Acta Physica Sinica

摘　　要：在连续升温条件下，测量了共析ＺｎＡｌ合金的应变速率和黏度随温度的变化曲线，在共析转变温区观测到伴随相变过程的黏度极小值，研究了应力对应变速率和升温速率对黏度极小值的影响，发现在相变温区材料的力学行为遵从Ｎｅｗｔｏｎ黏滞流变定律，用相界面的数量和性质解释了相变温区ＺｎＡｌ合金的黏滞流变行为．将相变激活能和相界面的流变激活能进行比较，说明界面的流动性是影响相变的主要因素．结合过去在非晶ＰｄＣｕＳｉ合金的结构转变过程中观测到的伴随玻璃转变和晶化过程的黏度极小值，说明伴随着结构转变或相变过程。Strain rate and shear viscosity are measured for Zn Al eutectoid alloy under continuous heating rate conditions.The minimum values of the shear viscosity accompanied by the eutectoid change process have been observed.The stress dependence of the strain rate and the heating rate dependence of minimum values of the shear viscosity have been investigated.It is found that the relation between strain rate and the stress in the temperature region of the phase transformation obeys Newtonian viscous flow law.The viscous flow behaviour of Zn Al eutectoid alloy in the temperature region of phase transformation can be explained with the number and the property of the phase interface.Comparing the activation energy of the phase transformation with that of viscous flow of the phase interface,it is found that the fluidity of phase interface is likely to be a primary factor which influences phase transformation process.In a previous work,the minimum values of viscosity have been observed in glass transition and crystallization process of amorphous Pd Cu Si alloy.According to these results,it is shown that the minimum viscosity emerged in structural transition process has some universality.

关 键 词：应变速率 共析合金 锌-铝 黏滞流变 合金学 内耗 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG131[金属学及工艺—金属学]