在Ｒｅｎｅ＇Ｎ４单晶镍基高温合金的高温时效过程中，发现γ＇粒子由立方形逐渐形成梅花状、并继续演变成枝晶形态，同时γ＇枝晶具有择域生长特性．公式推导证明，γ＇粒子的生长尺寸有一临界值α＇超过这一临界值后，γ＇粒子将通过错配位错造成粒子周边凹陷，以协调γ＇能量的增加，并进一步发展为枝晶状．
The morphology of γ' precipitate changed from cubic to flower like dendritic shape during high temperature ageing for a Rene'N4 single crystal Ni-base superalloy.The dendritic growth of γ' precipetate was of the selection area characteristic. The analysis results indicated that there was a critical growth size a* of γ' precipitate.As soon as the size of γ'was larger than the value of a * , the γ' precipitate would hollow and split by dismatch dislocation in order to match the increase of systematic energe of γ' and develop into dendrite.YU Xihong. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
参考文献
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| [6] | GabbTP,GardaJ,MminerRV．MetallTrans,1986 |
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