STRUCTURAL EVOLUTION OF UNDERCOOLED SINGLE-PHASE Ni-2wt%Pb MONOTECTIC ALLOY

作     者：H.X. Zheng, H. Xie and X.F. Guo (Xi’an University of Technology, Xi’an 710048, China) 

作者机构：Xi’an University of Technology 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2001年第14卷第1期

页      面：72-78页

核心收录：

学科分类：07[理学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 070205[理学-凝聚态物理] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China(Grant No:59871041)and the Natural Science Foundation of Shaanxi Education Admin 

主　　题：Granulation Lead alloys Microstructure Structure (composition) 

摘      要：The structural evolution of undercooled single-phase Ni-2wt%Pb monotectic alloy was systematically investigated by the method of molten glass denucleating combined with superheating cycle. Within the achieved undercooling range of 22 to 280 K, the solidification structure undergoes three changes at 22 K, 88 K and 187 K, respectively. With the increase of undercooling, common dendrites, the first class granular grains, undercooled dendrites and the second class granular grains come out one after the other. Analytical results show that the granulation mechanism of the first class granular grains is owing to dendrite remelting and recrystallization, and the granulation mechanism of the second is owing to dendrite break-up and recrystallization.