首页|不同应变下钛基复合材料的动态再结晶和硅化物析出行为

不同应变下钛基复合材料的动态再结晶和硅化物析出行为

Dynamic recrystallization and silicide precipitation behavior of titanium matrix composites under different strains

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为了研究TiB增强钛基复合材料在高温变形过程中的组织演变和硅化物析出行为,950℃时在应变速率为0.05 s−1,应变分别为0.04、0.40、0.70和1.00的工况下对其进行等温热压缩试验.研究发现:随着应变的增加,初生α相含量降低及其发生的连续动态再结晶和TiB增强相沿垂直压缩轴方向的定向分布导致应力趋于稳定,同时连续动态再结晶导致初生α相的取向差减小,从而削弱基体的织构强度.动态再结晶的机制主要是应变诱导晶界迁移以及TiB增强相诱导晶粒形核.元素扩散促进硅化物的析出,析出的Ti6Si3型硅化物主要分布在TiB及α相的界面上,TiB增强相通过阻碍位错的运动和提供形核质点加速硅化物的析出行为.
In order to elucidate the microstructure evolution and silicide precipitation behavior during high-temperature deformation, TiB reinforced titanium matrix composites were subjected to isothermal hot compression at 950 ℃, strain rate of 0.05 s−1 and employing different strains of 0.04, 0.40, 0.70 and 1.00. The results show that with the increase of strain, a decrease in the content, dynamic recrystallization of the α phase and the vertical distribution of TiB along the compression axis lead to stress stability. Meantime, continuous dynamic recrystallization reduces the orientation difference of the primary α phase, which weakens the texture strength of the matrix. The recrystallization mechanisms are strain-induced grain boundary migration and particle stimulated nucleation by TiB. The silicide of Ti6Si3 is mainly distributed at the interface of TiB and α phase. The precipitation of silicide is affected by element diffusion, and TiB whisker accelerates the precipitation behavior of silicide by hindering the movement of dislocations and providing nucleation particles.

titanium matrix compositesdynamic recrystallizationsilicide precipitationhot compression

赵而团、孙世臣、于金瑞、安钰坤、陈文振、陈瑞润

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山东理工大学 机械工程学院,淄博 255022

哈尔滨工业大学 材料科学与工程学院,威海 264209

哈尔滨工业大学 金属精密热加工国家重点实验室,哈尔滨 150001

钛基复合材料 动态再结晶 硅化物析出 热压缩

authors are grateful for the financial supports from the National Natural Science Foundation of ChinaNatural Science Foundation of Shandong Province,ChinaZhoucun School-City Integrationand the School-city Integration Development Project of Zibo,China

51871184ZR2019MEM0372020ZCXCZH032019ZBXC022

2021

10.1016/S1003-6326(21)65739-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(11)
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