摘要
采用熔体自蔓延直接合成法(Melt-SHS)制备不同颗粒含量的Ti B2/Al-Zn-Mg-Cu复合材料,并对其均匀化工艺进行优化及控制。结果表明,在相同均匀化时间下,复合材料的最佳均匀化温度较之基体合金的最佳均匀化温度降低,这主要是由于Ti B2颗粒加入使复合材料组织中的非平衡共晶相平均相间距缩小,进而缩短了元素扩散时间。相同均匀化时间下,复合材料每增加5vol%的Ti B2颗粒,最佳均匀化温度提升1~2℃,这是由于在非平衡共晶相平均相间距接近的情况下,Ti B2颗粒较低的导热系数及颗粒阻碍元素扩散共同作用的结果。均匀化后的复合材料组织中非平衡共晶相基本消除,颗粒分布未有明显变化。
TiBJAI-Zn-Mg-Cu composites with different volume fraction were fabricated by Melt-SHS,and the homogenization processes were modified.The results show that homogenization temperature of composites is lower than the matrix alloy under the same homogenization time, mainly due to the average non-equilibrium eutectic phase space of the composites is more narrow and shorter than the matrix,which makes the element diffusion time be shorter.Besides,each additional 5vo1%TiB2particles added in the composites,the optimum homogenization temperature increase 1-2℃,which is mainly because the synergistic effects of low thermal conductivity and obstruction element diffusion of TiB2particles.The balanced eutectic phase of the composites can be eliminated and the distribution of particles can be not significantly changed.
作者
王海靖
李贺
柴丽华
陈子勇
金头男
Wang Haijing;Li He;Chai Lihua;Chen Ziyong;Jin Tounan(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第12期71-77,共7页
Heat Treatment of Metals
关键词
均匀化
TIB2
铝基复合材料
显微组织
homogenization
TiB2
aluminum matrix composite
microstructure
作者简介
王海靖(1988一),男,硕士研究生,主要从事金属基复合材料研究工作,联系电话:17801070867,E—mail:kakura000@emails.bjut.edu.cn;通讯作者:陈子勇,教授,联系电话:010-7392280,E-mail:czy@bjut.edu.cn.
