【摘要】：采用熔體超溫處理技術(shù)對(duì)新型含Re和Ru的鎳基單晶高溫合金熔體進(jìn)行不同溫度的超溫處理,利用EPMA研究了定向凝固過程中合金元素的溶質(zhì)分布狀態(tài)及溶質(zhì)分配系數(shù)隨熔體超溫處理溫度變化的演化規(guī)律.結(jié)果表明,在平界面定向凝固條件下,隨熔體超溫處理溫度的升高,Al,Ta元素在固液界面前沿液相一側(cè)的分布呈現(xiàn)先增大后減小的趨勢(shì),而Re,W,Ru,Co元素則呈現(xiàn)與之相反的規(guī)律,Mo,Cr元素?zé)o明顯變化;而熔體超溫處理溫度對(duì)Ru,Co,Mo,Cr元素的溶質(zhì)分配系數(shù)影響較小.熔體超溫處理使合金熔體結(jié)構(gòu)發(fā)生變化,進(jìn)而影響元素分布,是導(dǎo)致溶質(zhì)分配系數(shù)發(fā)生變化的主要原因.
[Abstract]:The melt overtemperature treatment technology was used to treat the new Ni-base single crystal superalloy melt containing Re and Ru at different temperatures. The solute distribution of alloy elements and the evolution of solute partition coefficient with melt overtemperature treatment temperature during directional solidification were studied by EPMA. The results show that with the increase of melt temperature, the distribution of Al,Ta elements in the liquid phase at the front of the solid-liquid interface increases first and then decreases under the condition of directional solidification at the flat interface. However, the Re,W,Ru,Co element showed the opposite rule, the Mo,Cr element had no obvious change, while the melt overtemperature treatment temperature had little effect on the solute partition coefficient of Ru,Co,Mo,Cr element. The structure of alloy melt was changed by melt overtemperature treatment, which affected the distribution of elements, which was the main reason for the change of solute partition coefficient.
【作者單位】： 西北工業(yè)大學(xué)凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目51331005;51472200和51272211 航空科學(xué)基金項(xiàng)目2015ZF53067 國家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目2012AA03A511資助~~
【分類號(hào)】：TG132.3

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