(1. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院，上海 200240；
2. LEMHE/ICMMO, UMR 8182, Université Paris-Sud 11, Orsay 91405, France)
摘 要: 研究加熱過程中TiB2/6351Al及其基體合金噴丸形變層組織結(jié)構(gòu)的變化，利用X射線衍射線形分析方法計算不同加熱溫度和時間下的晶塊尺寸和顯微畸變。結(jié)果表明：噴丸使表層晶粒細化，織構(gòu)消失并且在加熱后不再出現(xiàn)；加熱過程中，復(fù)合材料晶塊長大速度低于基體材料，且復(fù)合材料顯微畸變更易釋放；噴丸過程中增強體周圍產(chǎn)生的高密度位錯使儲存能提高，從而促進再結(jié)晶，但晶塊的進一步長大因增強體的釘扎作用而受到阻礙；復(fù)合材料的熱穩(wěn)定性高于基體合金。
關(guān)鍵字: 復(fù)合材料；晶塊尺寸；顯微畸變；線形分析；噴丸；連續(xù)加熱
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. LEMHE/ICMMO, UMR 8182, Université Paris-Sud 11, Orsay 91405, France）
Abstract:The microstructures of 6351Al and TiB2/6351Al during heating process were investigated by X-ray diffractometry. Domain size and microstrain were calculated by modified Warren-Averbach method and Voigt method. The results show that the textures of both specimens are randomized by shot peening and do not appear again after any heat treatments. Domains grow during heat treatments, and the growth of domains in composite is slower than that of monolithic 6351Al alloy. The microstrain of composite is easier to release than that of the alloy. Higher density dislocation around reinforcements improves stored energy and promotes recrystallization while further domain growth is retarded. The thermostability of composite is higher than that of alloy.
Key words: composite; domain size; microstrain; line profile analysis; shot peening; continuous heating
