摘要
本文利用电子拉伸试验、扫描电镜、金相显微镜研究了Ｃｕ－Ｚｎ－Ａｌ－Ｍｎ－Ｎｉ－Ｔｉ合金的细化效果、断裂方式、记忆性能及伪弹性。结果表明：试验合金的铸态、轧态和淬火态组织得到明显细化。晶粒细化后合金室温拉伸断裂强度为７５０ＭＰａ，断裂应变为６．６％，同未细化的Ｃｕ基记忆合金相比强度大大提高，塑性也有所改善。低温拉伸时呈穿晶断裂，断口主要为准解理台阶；高温拉伸时呈微孔聚集型断裂。试验合金的室温完全可恢复应变为４．０％，完全伪弹性恢复应变为４．５％，均达到了多晶体材料的理论平均值。
study has been made for the grain refinement,fracture mode,strain-memory and pseudoelastic prop-erties of Cu-Zn-Al-Mn-Ni-Ti shape memory alloy by Electronic-Extension Experiment,SEM and OM. It was found that the casted,rolled and guenched structures were refined a great deal compered with the unre-fined Cu-based shape memory alloys,i.e. the mechanical properties of the experiment alloy had been re-markably improved,fracture strength at ambient temperature reached to 750MPa,fracture strain was up to 6.6%。 And the low-temperature fracture was mainly quasicleavage step,this demonstrated that the frac-ture mede was transgranular type fracture. Elevated-temperature fracture was dimple pattern indicating mi-crovoid type fracture mede. The experiment alloy exhibited excellent shape memory effect and pseudoelastic-ity,the perfect recoverable strain at ambient temperature was found to be 4.0%,and the maximum per-fect pseudoelasticity strain was about 4.5%,both were near the average theoretical value of polycrystulline materials.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1994年第4期9-12,共4页
Journal of Materials Engineering
关键词
力学行为
晶粒细化
合金
Shapo memory,Mechanical behavior,Grain refinement,Pseudoelasticity
