(1. 河北科技大學(xué) 材料科學(xué)與工程學(xué)院， 石家莊 050054；
2. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100083)
摘 要: 通過感應(yīng)熔煉和冷拔變形制備了Cu-16Fe-2Cr原位復(fù)合材料， 將銅基體選擇腐蝕后提取出了纖維，采用SEM和TEM觀察分析了纖維相結(jié)構(gòu)。 在較低的應(yīng)變量(η=1.67)時，纖維不均勻， 隨著變形量的增大（η=5.42）, 纖維外形變得均勻。 在η=5.42時，一個顯著的特點是單根Fe-Cr纖維分為一些由晶界隔開的平行亞單元（寬度約為100nm）， 通過亞單元共同的［1-10］衍射獲得了晶粒之間的相對取向，相鄰晶粒的取向角在3°～15°之間。
關(guān)鍵字: Cu-Fe-Cr原位復(fù)合材料； 選擇腐蝕； Fe-Cr纖維； 亞單元； 織構(gòu)
from Cu-Fe-Cr in situ composite
（1. School of Materials Science and Engineering,
Hebei University of Science and Technology,Shijiazhuang 050054, China；
2. School of Materials Science and Engineering,
University of Science and Technology Beijing,Beijing 100083, China）
Abstract:Cu-16Fe-2Cr in situ composites were manufactured by inductive melting and cold drawing. The filaments were extracted by use of a selective etching technique, and then the morphologies of isolated filaments were characterized by SEM and TEM. At lower drawing strains(η=1.67), Fe-Cr filaments morphology appears inhomogeneous. After higher amounts of deformation(η=5.42), the filaments have a more uniform shape. At η=5.42, the striking feature of a single filament is that it is divided into narrow(approximately 100nm) parallel subunits. These subunits are separated by distinct grain boundaries. Relative misorientations across the grain boundaries were obtained by imaging with the common ［1-10］ diffraction. The misorietation angles range from 3°to 15°.
Key words: Cu-Fe-Cr in situ composite; selective etching; Fe-Cr filament; subunit; t
