H80黄铜轧制退火晶界特征分布与不连续脱溶  

Grain Boundary Character Distributions and Discontinuous Precipitation in a Brass H80 Alloy with Cold Rolling and Annealing

作　　者：姜英[1] 王卫国[1] 郭红[1] 

机构地区：[1]山东理工大学,山东淄博255049

出　　处：《稀有金属材料与工程》2010年第A01期374-378,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50771060)

摘　　要：采用电子背散射衍射(EBSD)和扫描电镜(SEM)等技术研究了再结晶态黄铜H80轧制退火过程中的晶界特征分布(GBCD)与脱溶分解。结果表明:小变形后的H80在低温退火中,随退火时间增加∑3n(n=1,2,3)特殊晶界比例(fSBs)先增后减,当退火时间达到48h时,fSBs达到峰值76%,互成∑3n(n=1,2,3)界面关系的特殊晶粒团平均尺寸超过100μm,并且特殊晶界较好地阻断了一般大角晶界网络的连通性。继续延长退火时间到72h,则发生不连续脱溶转变。脱溶相与基体之间呈一般大角度界面关系,导致特殊晶界比例降低至50%以下,并且特殊晶粒团平均尺寸减小至约20μm。A recrystallized brass H80 alloy was cold rolled with small strain of 6% （thickness reduction） and then annealed at low temperature （633 K） for 4-96 h. The grain boundary character distributions （GBCD） and discontinuous precipitation in the processed samples were studied by means of electron back scatter diffraction （EBSD） and scanning electronic microscope （SEM）. The results show that the fraction of so-called ∑3^n （n=1, 2, 3） special boundaries （fsBs） was increased at first and then dropped with increments of annealing time after rolling. A peak value （76%） of SBs fraction was obtained when the annealing time reached 48 h, and meanwhile, the averaged size of the cluster of some special grain （SGs） interfaced by ∑3^n（n= 1, 2, 3） SBs exceeded 100 μm and the connectivity of random boundary network was essentially interrupted by SBs. Discontinuous precipitation occurred when the annealing time reached 72 h. Since the precipitates were interfaced by a smaller averaged size （about 20μm） of SGs clusters

关 键 词：H80黄铜 晶界特征分布 不连续脱溶 

分 类 号：TG111.7[金属学及工艺—物理冶金]