Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1402-05
TiB2/Al喷丸形变层连续加热组织结构
栾卫志1,姜传海1,王浩伟1,嵇 宁2

(1. 上海交通大学 材料科学与工程学院,上海 200240;
2. LEMHE/ICMMO, UMR 8182, Université Paris-Sud 11, Orsay 91405, France
)

摘 要: 研究加热过程中TiB2/6351Al及其基体合金喷丸形变层组织结构的变化,利用X射线衍射线形分析方法计算不同加热温度和时间下的晶块尺寸和显微畸变。结果表明:喷丸使表层晶粒细化,织构消失并且在加热后不再出现;加热过程中,复合材料晶块长大速度低于基体材料,且复合材料显微畸变更易释放;喷丸过程中增强体周围产生的高密度位错使储存能提高,从而促进再结晶,但晶块的进一步长大因增强体的钉扎作用而受到阻碍;复合材料的热稳定性高于基体合金。

 

关键词: 复合材料;晶块尺寸;显微畸变;线形分析;喷丸;连续加热

Microstructures of shot peened layer on TiB2/Al at elevated temperatures
LUAN Wei-zhi1, JIANG Chuan-hai1, WANG Hao-wei1, V. JI2

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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