高固相半固态ZK60-RE合金压缩过程液相变化机制  

Variation of Liquid During Compression of Semi-solid ZK60-RE Alloy at High Solid Content

作　　者：单巍巍[1] 罗守靖[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《特种铸造及有色合金》2007年第S1期388-391,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50475029)

摘　　要：研究了高固相半固态ZK60-RE合金压缩过程液相变化机制。结果表明,在压缩过程中,液相会在很小的应变处,形成液相路径。随着应变的增加,液相路径不断变化导致应力不断降低,宏观表现为触变行为。应变速率高时,液相路径呈不断生成及消失现象;应变速率低时,液相路径呈单一而逐渐变宽现象。Variation of liquid during compression of semi-solid ZK60-RE alloy at high solid content is studied in this paper.The results show that liquid path can form in a small strain.With increase the strain,the liquid path varies to decrease the stress,which means the thixotropic behaviour.When the strain rate was relatively low,liquid was squeezed out and formed liquid paths with a low speed and had enough time to gather gradually to make the flow stress progressively decrease;when the strain rate was relatively high,liquid formed liquid paths in a very short time and did not have enough time to absorb other liquid during compression.

关 键 词：高固相率ZK60-RE合金 液相路径 触变行为 应变速率 

分 类 号：TG249.9[金属学及工艺—铸造]