硼与Ni_3Al的再结晶  

Boron and the Recrystallization of Ni_3Al

作　　者：周碚之 高明[1] 周以苍 俞少罗[1] 

机构地区：[1]美国Lehigh大学,上海工程技术大学

出　　处：《金属热处理学报》1996年第A00期9-26,共18页

摘　　要：对无硼、含硼５００ｗｐｐｍ和含硼２０００ｗｐｐｍ的多晶Ｎｉ_３Ａｌ在７００～１０００℃范围内的再结晶和晶粒长大过程进行了研究。其中无硼和部分含硼５００ｗｐｐｍ的合金曾经受了１７％的冷压加工，而部分含硼５００ｗｐｐｍ和含硼２０００ｗｐｐｍ的合金分别经受了２０％和４０％的冷轧加工。研究中没有观察到明显可见的硼对再结晶和晶粒长大动力学的影响。上述材料的再结晶过程都遵循ＫＪＭＡ关系，并且都具有接近于１的Ａｖｒａｍｉ指数。晶粒长大过程都遵循指数关系，其时间常数均小于０．５。晶界类型分布（ＧＢＣＤ）测定结果表明，硼的加入强烈影响孪晶界（∑３晶界）出现的频度，把这一因素挪去，便看不到硼对任意晶界及其它类型晶界的作用。再结晶激活能与变形量之间的关系由实验结果揭示并定量导出。本文还就冷加工储能以及位错密度对再结晶的影响进行了讨论。The recrystallization and grain growth process of polycrystalline Ni_3Al free of boron, with 500 wppm and 2000 wppm boron in the temperature interval of 700～1000℃were studied. The boron-free alloy and part of the 500 wppm boroncontaining alloy have been cold compressed for 17%, and part of the 500 wppm and 2000 wppm boron-containing alloys have been cold rolled for 20% and 40% respectively. No obvious visible influence of boron on recrystallization and grain growth dynamics was observed. The recrystallization process of the above materials follows the KJMA relationship, and the Avrami exponent approaches unity. All the grain growth processes follow the exponential relationship, and the time constants are all less than 0.5. The results of the determination of GBCD show that boron affects strongly the frequency of occurrence of ∑3 boundaries, but no effect of boron on random boundaries and other types of grain boundary was observed when then the influence of the occurrence of ∑3 boundaries was excluded. The relationship between the activation energy of recrystallization and the amount of cold work were disclosed from experimental results and derived quantitatively. The stored energy of cold work and the influence of dislocation density on recrystallization were also discussed.

关 键 词：硼 再结晶 晶粒长大 位错 密度 镍铝合金 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG146.15[金属学及工艺—金属学]