THERMAL STABILIZATION TREATMENT AND THE EFFECT ON THE MICROSTRUCTURE IN DIRECTIONALLY SOLIDIFIED Ti-52%Al ALLOY

doi:10.3724/SP.J.1037.2013.00444

Acta Metall Sin

2014, Vol. 50

Issue (3): 329-336 DOI: 10.3724/SP.J.1037.2013.00444

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THERMAL STABILIZATION TREATMENT AND THE EFFECT ON THE MICROSTRUCTURE IN DIRECTIONALLY SOLIDIFIED Ti-52%Al ALLOY

LIU Guohuai, ZHANG Yuan, LI Xinzhong(

), CHEN Ruirun, SU Yanqing, GUO Jingjie, FU Hengzhi

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001

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Abstract

以Ti-52%Al合金为研究对象, 在Bridgman定向凝固炉中进行不同时间的热稳定处理实验及相关的定向凝固实验, 研究了定向凝固前糊状区的形成及其微观组织演化、界面形态和溶质分布, 并考察了热稳定处理对定向凝固组织的影响. 结果表明, 试样熔化后形成了由α相晶粒、晶粒间富Al液滴和液相通道组成的糊状区, 糊状区前沿为完全液相区. 随着热稳定处理时间的增加, 糊状区内α晶粒逐渐融合且沿温度梯度方向定向排布, 富Al液滴和液相通道逐渐消失, 固/液界面变得光滑平整. 热稳定处理时间足够长时, 糊状区内为单一的α相, 溶质Al的成分在生长方向近似沿着α固相线变化. 根据溶质守恒计算得出完全液相区内溶质Al含量为52.21%, 高于试样原始成分, 与实验测量结果相一致. 进一步研究热稳定处理对后续定向凝固组织的影响, 发现合理的热稳定处理时间(≥30 min)确保了定向凝固启动界面处存在稳定的温度场和浓度场, 柱状晶沿生长方向能够平行并列生长, 试样具有良好的定向效果.

Key words: TiAl alloy thermal stable treatment directional solidification microstructure

Received: 25 July 2013

ZTFLH:

TG249.9

Fund: Supported by National Natural Science Foundation of China (Nos.51071062, 51274077 and 51271068), National Basic Research Program of China (No.2011CB605504), Open Project of State Key Lab of Mold and Die Technology of Huazhong University of Science and Technology (No.2011-P03) and Fundamental Research Funds for the Central Universities (No.HIT.NSRIF.2013002).

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	Guohuai LIU
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	Yanqing SU
	Jingjie GUO
	Hengzhi FU

Cite this article:

LIU Guohuai, ZHANG Yuan, LI Xinzhong, CHEN Ruirun, SU Yanqing, GUO Jingjie, FU Hengzhi. THERMAL STABILIZATION TREATMENT AND THE EFFECT ON THE MICROSTRUCTURE IN DIRECTIONALLY SOLIDIFIED Ti-52%Al ALLOY. Acta Metall Sin, 2014, 50(3): 329-336.

URL:

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00444 OR https://www.ams.org.cn/EN/Y2014/V50/I3/329

Fig.1

纵向温度梯度作用下糊状区形成的示意图

Fig.2

Ti-52%Al合金不同热稳定处理后糊状区的宏观组织

Fig.3

不同热稳定处理时糊状区与完全液相区的成分分布

Fig.4

Ti-52%Al合金稳态时糊状区与完全液相区组织和成分分布图

Fig.5

简化的TiAl合金部分相图

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