分類號 . 密級 U D C 編號 中 南 大 學(xué) 士學(xué)位論文 論 文 題 目 i 液/固擴散偶的界面反應(yīng)研究 學(xué)科、專業(yè) 材 料 學(xué) 研究生姓名 袁 媛 導(dǎo)師姓名及 專業(yè)技術(shù)職稱 金 展 鵬 教 授 s he on i s I he i n/Ni 73K 73K 73K, 73K, is i)/ n/Ni 23K 38K is up by . is to in n/Ni n/Ni is by i (n , 22, 1 23K 4 is at 1i) 23K of by is by i (n 8, , 1 73K .5 1.5 s n on n n on n 73K of In 1(2(of in no by s V 摘 要 本次工作制備了一系列液 /固擴散偶， 用電子探針及掃描電鏡對其作了背散射電子像形貌分析和成分分析。 i 液 /固擴散偶在 773K 退火生成 而其在 873K 時退火先后生成了 。 i 擴散偶分別在 623K 和 738K 退火一小時，均生成了包含 和 1的擴散層。 關(guān)于 i 和 i 擴散偶的界面反應(yīng)，用 件，依據(jù)最大驅(qū)動力模型對其生成相順序及形貌進行了預(yù)測。預(yù)測結(jié)果和實驗結(jié)果吻合得很好，并對其形貌做了很好的解釋。 制備了一系列 i（ x= 8（亞共晶） ， （共晶） ，22（過共晶） ， 31(過共晶） )液 /固擴散偶。當(dāng)這些擴散偶在 623 均先生成了 相。隨退火時間延長，在 體和 相之間生成了1相，并形成了富 液相和 1相的混合區(qū)域。 在 873K 退火其最終擴散通道分別為 i)/2/2+i ）； i)/2/1/1+ i ）； i)/1/2/1/1+ i） 。 對這些擴散偶的擴散層形貌和成分分析， 初步確定了 623K 和 873初步確定了相形成序列和擴 散通道。此次實驗中發(fā)現(xiàn)了兩個的新三元相 1和 2，其成分分別約為 用 件初步外推了 元體系相圖。 外推結(jié)果很好的再現(xiàn)了 623K 時的實驗結(jié)果，并很好的解釋了其擴散層形貌。 s . . 1 . 1 b . 2 of . 4 he . 5 . 6 . 7 . 8 . 8 n i. 12 i n. 14 of on i n 18 . 20 ew . 23 . 23 . 24 . 25 . 26 of . 26 of . 29 . 29 of . 30 in . 34 . 36 . i . 38 . 38 . 38 . 40 s I n/Ni . 40 n/Ni . 42 i 23K. 43 i 73K. 49 . 57 . . 58 . 58 he . 59 . 59 of n/Ni 1 of n/Ni 4 he . 66 . 66 . 67 he . 67 . 69 . . 71 . 72 83s 1. is a a a 98K. In a in of or As a in of to of a in is to of in of 1, as As a It as a of by of to a is to of to is of on of i of to of be to a s 2 of C b n is 3a 0a a 56K, As of of Pb s 31. Pb of 50 mN/m 05K, 3470 mN/m 53K) 2. As an in at as .1 , Pb of or ) to or ) 3K. if it in a 26% in of to 3. Pb as a n u to by in b a it an is on of A of in A of to 5 m in in at 1. or b to 2. 2. MT is nPb to of of R, as by (R=(/g)1/2=2.2 is of MT .5 mm to a of in of to s 4 3. is is on of on of in is on of 4. of of in in at of of is is in of in In of It CB of to an to it is to of to or of of a of of a to as s 5of a is to of of A to be of of a of he a or a of an of it at a is of 56K. A of is a of a of is to or of is by or of a to as of a as or of s 6 of a 3. he n to on a of it to of n 04K. in in a is at a is 11K. as 11K, in a in in be a at be 11K to is of is 4. is to at in a as 0be in or of no is of to be in of at of