温度和晶粒尺寸及分布影响下的氧化铝纤维烧结晶粒长大的相场模拟  

Phase field simulation of grain growth in alumina fiber sintering under the influences of temperature,grain size and distribution

作　　者：张鲁 刘陆群 唐赛 马运柱[1] 刘文胜[1] ZHANG Lu;LIU Luqun;TANG Sai;MA Yunzhu;LIU Wensheng(National Key Laboratory of Science and Technology on High-strength Structural Materials,Central South University,Changsha 410083,China)

机构地区：[1]中南大学,轻质高强国家级重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2021年第4期320-328,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(U20A20240)。

摘　　要：采用相场法对溶胶凝胶法制备氧化铝纤维的高温烧结中α-Al_(2)O_(3)晶粒的生长进行仿真模拟,并结合实验,研究不同烧结温度和不同初始尺寸的α-Al_(2)O_(3)晶粒长大行为及动力学规律。相场模拟和实验结果均表明,在1200~1500℃烧结温度范围内,晶粒生长速率随烧结温度升高而明显增大,其中1400~1500℃温度区间内晶粒生长速率最快;初始晶粒尺寸越细小,晶粒生长速率越快。模拟结果显示,初始α-Al_(2)O_(3)晶粒尺寸不均匀性增加也会促进晶粒长大。The phase field method was used to simulate the growth of pureα-Al_(2)O_(3) grain generated in situ during high temperature sintering process of alumina fiber prepared by the sol-gel method.Combined with experiments,study the growth behavior and dynamics ofα-Al_(2)O_(3) grains at different sintering temperatures and different initial Al_(2)O_(3) grain size in the high temperature sintering stage was studied.Both phase field simulation and experimental results show that in the sintering temperature range of 1200-1500℃,the grain growth rate increases significantly with the increase of the sintering temperature,and the grain growth rate is the fastest in the temperature range of 1400-1500℃.The smaller the initial grain size,the greater the grain growth rate.The simulation result shows that the increasing unevenness of grain size can also promote grain growth.

关 键 词：相场法 氧化铝 晶粒长大 烧结 孔隙 

分 类 号：TB321[一般工业技术—材料科学与工程]