A novel hot pack rolling of high Nb-TiAl sheet from cast ingot

被引：45

作者：

Shen, Z. Z. ^{[1
]}

Lin, J. P. ^{[1
]}

Liang, Y. F. ^{[1
]}

Zhang, L. Q. ^{[1
]}

Shang, S. L. ^{[2
]}

Liu, Z. K. ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

INTERMETALLICS | 2015年 / 67卷

基金：

中国国家自然科学基金;

关键词：

Titanium aluminides; Mechanical properties; Rolling; microstructure; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; DESIGN CONCEPTS; BETA-PHASE; ALLOY; MICROSTRUCTURES; EVOLUTION; BEHAVIOR; MICRO;

D O I：

10.1016/j.intermet.2015.07.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-Nb containing (6-10 at.%) TiAl alloys exhibit excellent high-temperature strength and oxidation resistance. However, they are difficult to be fabricated into sheet in comparison with the conventional TiAl alloys. In the present work, the hot-deformation behavior of a high Nb-TiAl alloy (Ti-45Al-8.5Nb-0.2W-0.2B-0.03Y) was investigated. Hot-rolling process was optimized and carried out directly from the PAM (Plasma Arc Melting) ingot without the hot isostatic pressing (HIP) and hot forging. The hot-rolled sheets were successfully manufactured with dimensions up to 360 mm x 100 mm x 3.5 mm. The microstructure of as-rolled sheet is a typical "near gamma" characteristic with an average grain size about 15 mu m. In the view of breakdown the lamellar colonies of high Nb-TiAl alloy ingot, the direct hot-rolling process has advantage over hot can forging and extrusion. Moreover, mechanical properties at room and high temperatures were also tested. Noteworthily, the as-rolled high Nb-TiAl alloy shows superplasticity above 950 degrees C at relatively high strain rate of 5 x 10(-4). (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：19 / 25

页数：7

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