The creep behavior of a fully lamellar γ-TiAl based alloy

被引：27

作者：

Burtscher, Michael ^{[1
]}

Klein, Thomas ^{[1
,3
]}

Mayer, Svea ^{[1
]}

Clemens, Helmut ^{[1
]}

Fischer, Franz Dieter ^{[2
]}

机构：

[1] Univ Leoben, Dept Mat Sci, Franz Josef Str 18, A-8700 Leoben, Austria

[2] Univ Leoben, Inst Mech, Franz Josef Str 18, A-8700 Leoben, Austria

[3] Austrian Inst Technol, LKR Light Met Technol Ranshofen, Postfach 26, A-5282 Ranshofen, Austria

来源：

INTERMETALLICS | 2019年 / 114卷

关键词：

Intermetallics; Creep; Mechanical properties; Microstructure; Characterization; Electron microscopy; MICROSTRUCTURAL STABILITY; MECHANICAL-PROPERTIES; INTERMETALLIC ALLOYS; DEFORMATION; PHASE; DESIGN; REFINEMENT; FRACTION; SIZE; CAST;

D O I：

10.1016/j.intermet.2019.106611

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：

Intermetallic gamma-TiAl based alloys are in focus of interest because of their excellent mechanical properties at high temperatures in combination with their low density. Currently, they are used as turbine blades in aero engines at service temperatures up to around 1023 K. Therefore, the detailed knowledge of the creep behavior is of major interest. In this study, the influence of differently spaced fully lamellar microstructures on the creep behavior of an advanced micro-alloyed gamma-TiAI based alloy, a so-called TNM+ alloy, is investigated. Creep tests at 1073 K using stresses of 150 and 200 MPa are conducted applying a constant load. In order to describe the creep behavior, a so-called one-parameter model, which uses the mean lamellar interface spacing as governing parameter, is adopted. The different lamellar spacings of the specimens are analyzed by means of transmission electron microscopy. Finally, based on a new constitutive law creep curves are calculated and compared with experimentally determined creep curves. The results are discussed in the light of existing literature.

引用

页数：9

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