Microstructure and mechanical properties of a rapidly solidified Ni3Al-Cr alloy after thermal treatments

被引：11

作者：

Pérez, P ^{[1
]}

González, P ^{[1
]}

Garcés, G ^{[1
]}

Caruana, G ^{[1
]}

Adeva, P ^{[1
]}

机构：

[1] Ctr Nacl Invest Met, Madrid 28040, Spain

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2000年 / 302卷 / 1-2期

关键词：

rapid solidification; precipitation; intermetallics; mechanical properties;

D O I：

10.1016/S0925-8388(99)00580-0

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：

The effect of thermal treatments at 750, 900 and 1000 degrees C on the microstructure and mechanical properties of a rapidly solidified Ni3Al-Cr ahoy is reported. The microstructure of the ribbons in the as-rapidly solidified (RS) condition consisted of a partially ordered Ni3Al matrix and a fine Cr-rich second phase located at cell and grain boundaries. New and coarser alpha-Cr particles precipitated after annealing at 750 degrees C. No significant changes in the microstructure were observed for longer times. The alpha-Cr precipitates tended to dissolve in the Ni3Al matrix after annealing at 900 and 1000 degrees C. This dissolution seems to be controlled by the lattice Cr-diffusion in Ni3Al since the volume fraction of alpha-Cr particles decreased with increasing time and/or temperature of thermal treatments. The mechanical properties of the ribbons were influenced by the microstructural changes such as grain size, volume fraction and size of the alpha-Cr precipitates, that occurred during the annealing treatments. Thus, ribbons in the RS condition and after annealing at 750 degrees C were brittle however, they exhibited ductile behaviour after thermal treatments at 900 and 1000 degrees C. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：137 / 145

页数：9

共 33 条

[1] MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF RS NI-CR-AL MELT-SPUN ALLOYS [J].