定向凝固速度对Cu-Cr合金组织形貌的影响  

Effect of Solidification Rates on the Microstructure Morphology of the Cu-Cr Alloy

作　　者：毕晓勤[1] 傅恒志[2] 胡锐[2] 李金山[2] 

机构地区：[1]河南工业大学材料科学与工程学院,河南郑州450007 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《金属热处理》2007年第8期36-40,共5页Heat Treatment of Metals

基　　金：河南省自然科学基金(0511052400)

摘　　要：在高梯度定向凝固装置上制备Cu-1·0%Cr(质量分数)合金,用金相显微镜、扫描电镜进行微观组织的观察,研究定向凝固速度对Cu-Cr合金微观组织形貌的影响。研究结果表明,Cu-1·0%Cr合金定向凝固组织形貌为:初生α相和(α+β)共晶组织相间生长,宏观上沿凝固方向呈纤维状排列;随着凝固速度的提高,凝固组织随着凝固界面形态的演化,出现胞晶组织→粗树枝晶组织→细树枝晶组织的一系列的形貌变化。The Cu-1.0wt% Cr alloy was prepared by the high temperature gradient directional solidification equipment. The microstructure and its evolution of directionally solidified Cu-Cr alloy were investigated under the condition of different solidification rates ,by use of optical microscope and SEM. The results show that the microstructures of the directionally solidified Cu-1.0wt% Cr alloy consist of primary α phase and （ α＋ β） eutectics, which are even each other and regular along the directional orientation. The microstructure morphology undergos a series of change from cystiform, thick dendrite to thin dendrite with the increase of solidification rates.

关 键 词：凝固速度 CU-CR合金 组织形貌 

分 类 号：TB331[一般工业技术—材料科学与工程]