| NiAl基多相金属间化合物的显微组织,超塑性研究 |
| |
| 引用本文： | 陈荣石,郭建亭,殷为民,周继扬.NiAl基多相金属间化合物的显微组织,超塑性研究[J].金属学报,1998,34(11):1121-1125. |
| |
| 作者姓名： | 陈荣石 郭建亭 殷为民 周继扬 |
| |
| 作者单位： | 中国科学院金属研究所!沈阳，110015，大连理工大学材料工程系，大连，116023，中国科学院金属研究所!沈阳，110015，中国科学院金属研究所，!!沈阳，110015，大连理工大学材料工程系!大连，116023 |
| |
| 基金项目： | 国家863计划!715-005-0030，国家自然科学基金!59895152 |
| |
| 摘 要： | 本文研究了金属间化合物Ni—25Al—25Cr的显微组织和超塑性及其变形机理.该合金的显微组织由NiAl则基体和α-Cr，β-Ni（Al，Cr）；γ'-Ni3（Al,Cr）的三元共晶体组成，在NiAl基体中还均匀分布着大量弥散的α-Cr沉淀相在1123—1223K之间以22×10-43．3×10－2S－1的应变速率拉伸变形时．该合金表现出高达480％的超塑性超塑性变形的断裂主要是由于晶界滑移和晶粒转动所产生的空洞和晶内解理所致.本文还对超塑性变形的机理进行了初步讨论.
|
| 关 键 词： | NiAl 超塑性 显微组织 金属间化合物 |
| 收稿时间： | 1998-11-18 |
| 修稿时间： | 1998-11-18 |
INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY |
| |
| CHEN Rongshi,GUO Jianting,YIN Weimin,ZHOU Jiyang.INVESTIGATION ON MICROSTRUCTURE AND SUPERPLASTICITY OF A NiAL-BASED MULTIPHASE ALLOY[J].Acta Metallurgica Sinica,1998,34(11):1121-1125. |
| |
| Authors: | CHEN Rongshi GUO Jianting YIN Weimin ZHOU Jiyang |
| |
| Affiliation: | CHEN Rongshi,GUO Jianting,YIN Weimin,ZHOU Jiyang (Institute of Metal Research,Chinese Academy of Sciences,Shenyang )(Department of Materials Engineering,Dalian University of Technology,Dalian ) |
| |
| Abstract: | The microstructure of a NiAl-based multiphase alloy with a composition of Ni-25Al-25Cr has been investigated, which consists of NiAl matrix surrounded by a eutectic of α-Cr, β-Ni(Al,Cr) and γ'-Ni3(Al,Cr), and a large amount of α-Cr precipitates distributed uniformly in NiAl matrix. This alloy exihibits superplasticity elongation as high as up to 480% at 1123-1223 K and strain rates of 2.2×10-4 -3.3×10-2 s-1. The fracture after superplasticity deformation results from cavities generated by grain boundary sliding and cleavage in the grains, the mechanism for superplasticity has also been discussed. |
| |
| Keywords: | NiAl superplasticity microstructure fracture mechanism |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《金属学报》浏览原始摘要信息 |
|
点击此处可从《金属学报》下载全文 |
|
