男男野外做爰全过程69,玩弄邻居少妇苏梅

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中國有色金屬學(xué)報

ZHONGGUO YOUSEJINSHU XUEBAO

第10卷第5期總第38期 2000年10月

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文章編號：1004-0609(2000)05-0688-04

Al-Mg-Si合金的凝固過程

吳鏘^１，孫斐^１，孫強金^１，姜石峰^２

(1. 南京理工大學(xué) 材料科學(xué)與工程系，南京 210094;
2. 韓國機械研究院材料工程部, 韓國)

摘要: 研究了AlMgSi合金的凝固過程，用不同方法測量了合金成分與冷卻速度對該合金系鑄態(tài)組織的影響。通過形態(tài)分析確定了AlMgSi合金的凝固順序，用EPMA測定了非平衡過程的溶質(zhì)分布，并發(fā)現(xiàn)FeSiAl₄_～5相成分在高冷速時為FeSiAl₅，而在低冷速時為FeSiAl₄。晶界附近發(fā)現(xiàn)了無溶質(zhì)帶(NSZ)，并從固態(tài)擴散和凝固溶質(zhì)再分配兩個方面分析了NSZ的形成原因。

關(guān)鍵字: 鋁合金；鑄態(tài)組織；溶質(zhì)分布；無溶質(zhì)帶

Solidification process of AlMgSi alloys

WU Qiang^１, SUN Fei^１, SUN Qiangjin^１, KANG Shifeng^２

（1. Department of Materials Science and Engineering,Nanjing University of Science and Technology, Nanjing 210094, P.R.China；
2. Materials Engineering Department, Korea Institute of Machinary and Metals, Changwon 641010, Korea）

Abstract:The solidification process of AlMgSi alloys was studied. The composition and cooling rate were changed and their influences on ascast microstuctures were studied. The solidification paths of AlMgSi alloys were determined by the analysis of microstructure. The solute distribution during nonequilibrium solidification process was measured by EPMA . It was found that the composition of FeSiAl₄_～₅ phase was FeSiAl₅ at high cooling rate and FeSiAl₄ at low cooling rate. No solute zone (NSZ) was found in the matrix in the vicinity of boundary, the mechanism of the formation of NSZ was analyzed with the theories of solid diffusion and solute redistribution.

Key words: AlMgSi alloys; ascast microstucture; solute distribution; no solute zone

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW