5A01铝合金高温压缩流变行为.pdf

w. kululu,cm
第14卷第6期
粉末冶金材料科学与工程
2009年12月
Vol 14 No 6
Materials Science and Engineering of Powder Metallurgy
5A01铝合金高温压缩流变行为
刘成,罗兵辉,柏振海,陈星霖
(中南大学材料科学与工程学院,长沙410083)
摘要:采用 Gleeble-1500热模拟机高压缩试验,研究5AO铝合金在应变速率为0.01~1s、变形温度为350
450℃条件下的流变行为,并利用光学显微镜分析合金在不同压缩条件下的组织形貌特征。结果表明:应变速率和
变形温度的变化强烈影响合金流变应力的大小,流交应力随变形温度升高而降低,随应变速率提高而増大。采用双
曲正弦形式 ARRHENIUS的关系来描述5A01铝合金高温压缩变形时的流变应力行为,获得的材料常数A、a、n和
Q分别为006831s1、0.0094MPa1、2.7089和161.14kl/mol;在应变速率为0.01s及变形温度低于400℃条件
下变形时,5A01铝合金组织为纤维组织,而当变形温度升高到450℃时,再结晶程度很高,出现大量等轴晶。
关键词:5A01铝合金:高温压缩;流变应力;显微组织
中图分类号:TG115:TG116
文献标识码:A
文章编号:1673-0224(2009)6-373-06
High temperature rheologic behavior of
5A01 aluminum alloy
LIU Cheng, LUO Bing-hui, BAI Zhen-hai, CHEN Xing-lin
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The rheologic behavior of 501 aluminum alloy over the strain rate range 0.01-1 s and the temperature
range o
of 350 C to 450 C has been studied on Gleeble-1500 hot simulator. The microstructures of the alloy were
analysed with optical microscope. The experimental results show that the rheologic stress characteristic exists during hot
compressive deformation of 5A01 aluminum alloy in the range of experiments. It has been found that the rheology stress
is controlled by both strain rate and deforming temperature, the rheologic stress decreases with the increasing of
deforming temperature, while increases with the increasing of strain rate. The rheologic stress of 5A01 alloy during high
temperature deformation can be expressed by ARRHENIUS function, and the values of A, a, n and Q are 0.068 31
s,0.009 4 MP,2.7089, 161.14 KJ/mol, respectively. When the strain rate is 0.01s and the test temperature is less
than 400 C, the microstructure of the 5A01 alloy exhibits fibrous tissues. When the deformation temperature is up to 450
C, the degree of recrystallization is high and a great number of equiaxed grains are appeared
ey words: 5A01 aluminum alloy; high temperature deformation; flow stress; microstructure
5A1属于5×メX系铝合金,热处理不可强化,分数)小于6%的铝一镁合金,对含镁量更高的铝合金
具有中等强度,可焊,耐蚀性良好,主要用作舰艇用(如5A0)高温压缩时流变应力的研究报道甚少。金属
铝合金板材以及耐蚀、可焊铝合金结构件,如高速舰热变形流变应力是材料在高温下的基本性能之
艇艇体,大型水面舰船上层建筑、舾装件、导弹发射它不仅受变形温度、变形程度、应变速率和合金化学
装置以及其他海洋工程结构部件等
成分的影响,也是变形体内部显微组织演变的综合反
近年米,国内外对5XX×系铝合金高温压缩流映。研究5A01铝合金高温乐缩流变行为无论在制定
变行为的研究十分活跃2,但多是研究含镁量(质量合理的热加工.工艺方面,还是在金属塑性变形理论的
基金项目:国家“十一五”配套资助项目(JPPT-115-2024)
收稿日期:2009-05-25;修订日期:2009-07-10
通讯作者:刘成,博士研究生:电话:15116335132:E-mai:liucheng-csu@163.com