文章信息/Info

Title:

Effect of Alloy Refiners on Growth Morphology and Micro-segregation of Equiaxed Dendrites

作者:

 東青1; 張佼1; 董錦芳1; 謝紅蘭2; 孫寶德1

 (1上海市先進(jìn)高溫材料及其精密成形重點(diǎn)實(shí)驗(yàn)室，上海交通大學(xué)，上海 200240，中國(guó))
(2上海光源，上海應(yīng)用物理研究所，上海 215600，中國(guó))

Author(s):

 DONG Qing1;  ZHANG Jiao1;  DONG Jinfang1;  XIE Honglan2;  SUN Baode1

 (1 Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China)
(2 Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Shanghai 215600, China)

關(guān)鍵詞:

 ; 等軸枝晶; 合金細(xì)化劑; 形態(tài); 偏析

DOI:

10.7502/j.issn.1674-3962.2016.09.08

文獻(xiàn)標(biāo)志碼:

A

摘要:

 對(duì)等軸晶形核及生長(zhǎng)過(guò)程的研究具有重要的科研價(jià)值和實(shí)用意義。除了通過(guò)數(shù)學(xué)模型進(jìn)行理論研究，直接的觀察極有必要。長(zhǎng)期以來(lái)，由于高溫熔體對(duì)可見光不透明，金屬的凝固過(guò)程一直是一個(gè)“黑箱”。X射線同步輻射成像技術(shù)的發(fā)展使金屬凝固過(guò)程的動(dòng)態(tài)、連續(xù)觀察成為可能。作為一種高亮度、高能量的X射線源，同步輻射X光可以穿透數(shù)毫米厚的鋁熔體并形成清晰影像。近年來(lái)，本課題組針對(duì)合金凝固過(guò)程中的形態(tài)演化問(wèn)題在上海同步輻射光源開展了持續(xù)研究，本文介紹其中部分研究結(jié)果，內(nèi)容涉及凝固過(guò)程中等軸枝晶的形成和長(zhǎng)大的動(dòng)態(tài)觀察，特別關(guān)注形核劑的添加對(duì)等軸枝晶生長(zhǎng)形態(tài)和元素微觀偏析的影響。

Abstract:

It has important scientific value and practical significance to investigate nucleation and growth process of equiaxed dendrites. In addition to theoretical study by mathematical model, direct observations are very necessary. For a long time, the solidification process of metals has been a "black box" due to the high temperature melt that is opaque to visible light. The development of X-ray synchrotron radiation imaging technology has made it possible to carry out dynamic and continuous observations of metal solidification. As a high brightness, high energy X-ray source, synchrotron radiation X-ray can penetrate aluminum melt with a thickness of several millimeters and obtain clear images. In recent years, our research group carried out continuous research in the field of alloy solidification morphology evolution in Shanghai synchrotron radiation facility (SSRF). Some research results were reported in this paper, involving dynamic observations of the formation and growth of the equiaxed dendrites. A special attention was made to the effect of alloy refiners on growth morphology and micro-segregation of equiaxed dendrites.