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放电等离子烧结温度对纯钛相变致密化动力学与组织的影响 被引量:2

Effect of spark plasma sintering temperature on densification kinetics and microstructure during pure titanium phase transition
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摘要 基于揭示金属钛α?β相变对放电等离子烧结(spark plasma sintering,SPS)致密化动力学的影响行为,本文开展了不同烧结温度(700~1 000℃)下纯钛粉SPS实验,通过引入适用于SPS烧结金属的扩散模型,对致密度化动力学进行分析。结果表明,在烧结温度700和800℃等低于相变温度时,样品致密化速度较慢,保温初期,致密化机制以颗粒重排为主;保温后期,致密化机制以扩散为主。在烧结温度900和1 000℃时,由于β-钛相相对于α-钛相在扩散速度和塑性变形能力等方面均有所提高,因此致密化速度更快。900和1 000℃样品腐蚀后显示存在大量马氏体,900℃时样品晶粒未明显长大,而经1 000℃烧结的样品晶粒长大明显。 A series of sintering experiment with temperature of700?1000℃were designed to study the effect of titaniumα?βphase transition on densification kinetics and microstructures of pure titanium powder during Spark Plasma Sintering(SPS).By chosing the appropiate diffusion model for SPS of metal materials,the densification kinetics was revealed.The results indicate that,at sintering temperatures of700and800℃,which are lower than phase transition temperature,the densification rate is slow,and particles rearrangement dominates the densification mechanism in the beginning of dwelling,whereas diffusion dominates the densification mechanism in the end of dwelling.At temperature900and1000℃,based on higher self-diffusion rate and ability of plastic deformation ofβ-titanium,the powder densification rate is quicker than that of at lower temperature.Plenty of martensite exists in the sample sintered attemperatures of900℃and1000℃.The grain size is limited at900℃sintered sample but grows obviously at1000℃sintered sample.
作者 刘广宏 袁铁锤 李瑞迪 翁启钢 袁继维 LIU Guanghong;YUAN Tiechui;LI Ruidi;WENG Qigang;YUAN Jiwei(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;Zunbao Titanium Co., Ltd, Zunyi 563004, China;Guizhou R & D Titanium Materials Co., Ltd, Zunyi 563000, China)
出处 《粉末冶金材料科学与工程》 北大核心 2017年第5期650-655,共6页 Materials Science and Engineering of Powder Metallurgy
基金 国家自然科学基金(51474245 51571214)
关键词 放电等离子烧结 烧结温度 纯钛粉 相变 致密化动力学 spark plasma sintering sintering temperature pure titanium powder phase trasition densification kinetics
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