Preparation of the initial solid-liquid interface and melt in directional solidification of Al-18 at%Ni peritectic alloy

被引：27

作者：

Su, Yanqing ^{[1
]}

Liu, Dongmei ^{[1
]}

Li, Xinzhong ^{[1
]}

Luo, Liangshu ^{[1
]}

Guo, Jingjie ^{[1
]}

Fu, Hengzhi ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

JOURNAL OF CRYSTAL GROWTH | 2010年 / 312卷 / 16-17期

基金：

中国国家自然科学基金;

关键词：

Directional solidification; Initial solid-liquid interface; Thermal stabilization; Peritectic; TEMPERATURE-GRADIENT; MICROSTRUCTURE SELECTION; PHASE; SYSTEMS;

D O I：

10.1016/j.jcrysgro.2010.05.018

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The preparation of the initial solid-liquid interface and melt is a critical step in directional solidification process. Experiments on Al-18 at%Ni peritectic alloy consisting of melting followed by thermal stabilization ranging from 0 to 2 h were carried out in a Bridgman-type furnace. In the directional melting process, due to the temperature gradient imposed on the rod, a mushy zone was created between the complete liquid zone and non-molten solid zone parallel to the temperature gradient. With the thermal stabilization time increase, the volume fraction of the liquid inclusions in the mushy zone decreased. After 2 h of thermal stabilization, the initial solid-liquid interface was corrugated, and the Ni concentration in the complete liquid melt zone was uniform but below the original composition. A solute diffusion transport model in a temperature gradient was proposed to describe the concentration evolution both in the mushy zone and the complete liquid melt zone during thermal stabilization. (C) 2010 Elsevier B.V All rights reserved.

引用

页码：2441 / 2448

页数：8