(中國科學(xué)院 金屬研究所， 沈陽 110016)
摘 要: 對高溫合金單晶選晶生長工藝進行了實驗研究，揭示了螺旋選晶器和縮頸選晶器的選晶原理。實驗結(jié)果表明，在螺旋選晶器中，晶體橫向擇優(yōu)生長與螺旋結(jié)構(gòu)的耦合作用，形成連續(xù)選晶過程，是螺旋選晶的主要原理，其選晶作用良好；而在縮頸選晶器中，幾乎只存在單一的機械阻隔選晶行為，多重縮頸結(jié)構(gòu)對于改善選晶作用并不明顯，選晶效果不好。
關(guān)鍵字: 單晶高溫合金； 單晶生長； 選晶
（Institute of Metal Research， Chinese Academy of Sciences，
Shenyang 110016， P.R.China）
Abstract:The single crystal selectionprocesses of superalloy in the helix selector and thinneck selector were studied. The results indicate that the main grain selection mechanism of the helix selector is that the easy growth direction of the cubic crystal coupled with the helical structure of the selector. Helix selector combines with the characteristics of thinneck and angled grain selector in structure. In thinneck selector， there is only the grain selection function of mechanical restricting， and the design of multiple thin necks is not beneficial to improving the grainselection effect.
Key words: single crystal superalloy; single crystal growth; grain selection
