渭南师范学院学报
渭南師範學院學報
위남사범학원학보
Journal of Weinan Teachers College
2015年
18期
47-50
,共4页
Nb-Si基合金%凝固行为%初生相%凝固组织
Nb-Si基閤金%凝固行為%初生相%凝固組織
Nb-Si기합금%응고행위%초생상%응고조직
Nb-Si based alloy%solidification behavior%primary phase%solidificational microstructure
Nb－Si基合金具有高熔点、密度适中和优良的室温和高温力学性能，成为镍基高温合金的替代材料．为了研究不同成分合金的组织变化规律，模拟了Nb－Si合金的凝固行为．随着Si所占比例从10％增加到50％的过程中，初生相最开始是Nbss（铌基固溶体），当Si的比例为20％～30％时初生相转变为Nb3 Si，当Si含量为50％时初生相转变为Nb5 Si3．共晶组织最开始为Nbss＋Nb3 Si，随着Si比例增加到30％，而转变为Nb5 Si3＋Nb3 Si，Si比例继续增加到50％时，共晶组织为Nb5 Si3＋NbSi2．
Nb－Si基閤金具有高鎔點、密度適中和優良的室溫和高溫力學性能，成為鎳基高溫閤金的替代材料．為瞭研究不同成分閤金的組織變化規律，模擬瞭Nb－Si閤金的凝固行為．隨著Si所佔比例從10％增加到50％的過程中，初生相最開始是Nbss（鈮基固溶體），噹Si的比例為20％～30％時初生相轉變為Nb3 Si，噹Si含量為50％時初生相轉變為Nb5 Si3．共晶組織最開始為Nbss＋Nb3 Si，隨著Si比例增加到30％，而轉變為Nb5 Si3＋Nb3 Si，Si比例繼續增加到50％時，共晶組織為Nb5 Si3＋NbSi2．
Nb－Si기합금구유고용점、밀도괄중화우량적실온화고온역학성능，성위얼기고온합금적체대재료．위료연구불동성분합금적조직변화규률，모의료Nb－Si합금적응고행위．수착Si소점비례종10％증가도50％적과정중，초생상최개시시Nbss（니기고용체），당Si적비례위20％～30％시초생상전변위Nb3 Si，당Si함량위50％시초생상전변위Nb5 Si3．공정조직최개시위Nbss＋Nb3 Si，수착Si비례증가도30％，이전변위Nb5 Si3＋Nb3 Si，Si비례계속증가도50％시，공정조직위Nb5 Si3＋NbSi2．
As a promising candidate of Ni based high temperature materials, Nb-Si based alloy possesses high melting point, relatively low density and excellent high temperature strength. The solidificational simulations of Nb-Si based alloy were studied in order to study the microstructure. The primary Nbss was presented firstly when the Si concentration was 10%, and the primary Nb5 Si3 was presented when the Si concentration varied from 20% to 30%, and the primary Nb5 Si3 was present when the Si concentration was higher than 50%. The eutectic colonies was composed of Nbss and Nb3 Si firstly, and the eutectic colonies was composed of Nb5 Si3 and Nb3 Si when the Si concentration is 30%, and the eutectic colonies was composed of Nb5 Si3 and NbSi2 when the Si concentra?tion is higher than 50%.
