( 中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 采用平板爆炸復(fù)合方法制備T2/QBe2復(fù)合板材， 并利用金相和掃描電鏡電子背散射衍射技術(shù)對復(fù)合界面附近處QBe2和T2側(cè)產(chǎn)生的絕熱剪切變形及形變孿生的微觀特征進(jìn)行了觀測。 結(jié)果表明：由于T2和QBe2在物理性能、 力學(xué)性能和熱學(xué)性能上的差異，在爆炸載荷條件下只在QBe2中產(chǎn)生絕熱剪切帶，并且絕熱剪切帶內(nèi)分布有十分細(xì)小的等軸晶； 帶內(nèi)晶粒取向基本相同， 帶與帶之間基體中的晶粒取向也基本相同， 且兩者還存在較大的取向差； 爆炸沖擊加載后， QBe2和T2兩側(cè)均產(chǎn)生了形變孿晶。
關(guān)鍵字: 爆炸復(fù)合； 絕熱剪切帶； 形變孿晶； 電子背散射衍射
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The T2/QBe2 composite was prepared by flat plate explosive cladding method. Microstructure characteristics of adiabatic shear deformation and deformation twins on both sides of QBe2 and T2 were investigated by means of optical microscope and SEM electronic backscatter diffraction techniques. The results indicate that adiabatic shear bands appear only on the side of QBe2 under the condition of explosive cladding because of the differences in physical, mechanical and thermal properties of T2 and QBe2， there are very fine equiaxed grains in adiabatic shear bands. Orientation of grains in the adiabatic shear bands and between shear bands is essentially consistent, while there is large difference of orientation between grains in adiabatic shear bands and matrix. Deformation twins are found in both T2 and QBe2 matrixes after explosive loading.
Key words: explosive cladding; adiabatic shear band; deformation twin; electronic backscatter diffraction
