纳米材料铜锌合金经低温退火出现的硬化现象  

Hardening Phenomenon of Nano-materials Cu-Zn Alloys by Low Temperature Annealing

作　　者：李鹏[1] 周世同[1] 吕潍威 朱心昆[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《热加工工艺》2016年第4期199-201,共3页Hot Working Technology

基　　金：国家自然科学基金项目(50874056)

摘　　要：经低温液氮轧制的Cu-30%Zn在短时低温退火之后出现异常硬化,其中低温短时退火是为防止晶粒长大。通过万能试验机对其退火之后的试样进行拉伸测试和通过XRD对退火之后试样的微观组织进行分析。结果表明:由于低温退火使Cu-30%Zn的位错密度下降,而拉伸测试时为了开动新的位错源,外界必须施加更大驱动力,从而表现出硬化现象。分析了纳米晶体材料Cu-30%Zn退火之后的力学性能与其微观组织之间的联系机理。After annealing at short time and low temperature, Cu - 30%Zn rolled in the liquid nitrogen shows abnormal hardening. In order to prevent the grains growing, the short time and low temperature annealing was choosen. By the tensile testing machine, the mechanical property of the sample was analyzed. The microstructure of the sample was analyzed by XRD. The results show that because of the decrease of the sample＇s dislocation density which is annealed at low temperature for activating new source of dislocation, it shows abnormal hardening. The relationship mechanism between mechanical property and microstructure of the LNR CU-30%Zn which was annealed at short time and low temperature was analyzed.

关 键 词：铜锌合金 纳米材料 低温退火 力学性能 微观组织 

分 类 号：TG113.25[金属学及工艺—物理冶金]