1300 K creep behavior of [001] oriented Ni-49Al-1Hf (at.%) single crystals

被引：37

作者：

Whittenberger, JD ^{[1
]}

Locci, IE

Darolia, R

Bowman, R

机构：

[1] Case Western Reserve Univ, NASA, Glenn Res Ctr Lewis Field, Cleveland, OH 44106 USA

[2] Gen Elect Aircraft Engines, Cincinnati, OH USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 268卷 / 1-2期

关键词：

creep; NiAL; Ni-49Al-1Hf; single crystals;

D O I：

10.1016/S0921-5093(99)00071-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A study of the 1300 K compressive and tensile creep properties of [001]-oriented NiAl-1Hf (D209) single crystals has been undertaken. Neither post homogenization cooling treatment, minor chemical variations within an ingot or from ingot-to-ingot, nor testing procedure had a significant effect on mechanical behavior; however a heat treatment which dissolved the initial G-phase precipitates and promoted formation of Heusler particles led to a strength reduction. Little primary creep was found utilizing direct measurement of strain, and a misorientation of 18 degrees from the [001] did not reduce the creep strength. The effects of heat treatments on properties and a comparison of the how stress-strain rate data to those predicted by the Jaswon-Cottrell solid solution hardening model indicate that the 1300 K strength in NiAl-1Hf single crystals is mainly due to precipitation hardening mechanisms. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：165 / 183

页数：19

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