Ti与含Ti或B中间合金对铝晶粒细化效果及抗高温衰退能力的影响  

Influence of Ti and Master Alloys Containing Ti or B on the Effects of Grain Refinement and Resistance to Fading in Pure Al

作　　者：王春雷[1] 王明星[1] 刘忠侠[1] 翁永刚[1] 宋天福[1] 马润香[1] 杨升[1] 

机构地区：[1]郑州大学物理工程学院教育部材料物理重点试验室,河南郑州450052

出　　处：《铸造》2005年第12期1250-1253,共4页Foundry

基　　金：河南省重大科技攻关资助项目(0322020600)。

摘　　要：对比研究了电解加钛和含钛或硼中间合金对铝的晶粒细化效果及抗高温衰退能力的影响。结果表明,电解加钛和Al-5Ti中间合金在熔体温度较低时具有较好的晶粒细化效果,但随着熔体温度的升高,细化效果均迅速衰退;电解加钛再熔配加Al-4B中间合金可在熔体温度为720℃时获得最佳的细化效果,随着熔体温度的升高细化效果有所衰退,但衰退速度较慢;在加入Al-5Ti的同时加入Al-4B中间合金可明显提高Al-5Ti的晶粒细化效果和抗高温衰退能力,但效果不如电解加钛加Al-4B中间合金;Al-5Ti-1B中间合金具有最强的抗高温衰退能力,随着熔体温度的升高,晶粒不但不粗化反而有所下降,当熔体温度高于900℃时,才出现衰退现象。对试验结果及晶粒细化机制进行了分析。The influences of Ti added by electrolysis and the master alloys containing Ti or B on the effects of grain refinement and resistance to fading were investigated in pure Al. The results indicate that the Ti added by electrolysis and Al-5Ti master alloy have good effects of grain refinement when the aluminum melt temperature is lower. But the effect of grain refinement fades rapidly with the rise of the melt temperature; By adding Al-4B master alloy to electrolytic low-titanium aluminum alloy at 720 ~C, the best effect of grain refinement can be obtained and the effect fades slightly with the rise of the melt temperature; When Al-5Ti and Al-4B are added to the aluminum melt simultaneously, the effect of grain refinement of Al-5Ti master alloy can be improved obviously, but it is inferior to that of adding Al-4B master alloy to electrolytic low-titanium aluminum alloy; Al-5Ti-IB master alloy has the strongest ability of resistance to fading, the grain size of the sample first decreases with the melt temperature increasing. When the melt temperature is higher than about 900℃, the fading occurs. The experimental results and the grain refinement mechanism are also discussed in this article.

关 键 词：熔体温度 电解加钛 中间合金 晶粒细化 

分 类 号：TG27[金属学及工艺—铸造]