Ti-38644合金中硅化物的溶解析出及对力学性能的影响

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英文篇名：Dissolution and Precipitation Behaviors of Silicides of Ti-38644 Alloy and Their Effects on Tensile Properties 作者：巴宏波 ; 董利民 ; 张志强 ; 王海忠 ; 徐东生 ; 杨锐 英文作者：Ba Hongbo;Dong Limin;Zhang Zhiqiang;Wang Haizhong;Xu Dongsheng;Yang Rui;Institute of Metal Research,Chinese Academy of Science;Liaoning University of Technology; 关键词：Ti-38644钛合金 ; 硅化物 ; 拉伸性能 ; 断裂模式 英文关键词：Ti-38644 titanium alloy;;silicide;;tensile properties;;fracture mode 中文刊名：COSE 英文刊名：Rare Metal Materials and Engineering 机构：中国科学院金属研究所;辽宁工业大学; 出版日期：2017-06-15 出版单位：稀有金属材料与工程 年：2017 期：v.46 语种：中文; 页：COSE2017S1002 页数：6 CN：S1 ISSN：61-1154/TG 分类号：9-14

摘要

研究了Ti-38644合金中硅化物的溶解和析出行为及其对室温拉伸性能的影响,并利用扫描电镜和透射电镜对显微组织、析出相及拉伸断口进行了观察和分析。结果表明,合金中的杂质Si导致(TiZr)_6Si_3硅化物的形成。在700~950℃之间固溶1 h后,合金中的硅化物随固溶温度升高逐渐溶解,而950℃固溶样品中未观察到硅化物。由于硅化物的溶解和β晶粒长大,800~950℃之间固溶后的合金强度随固溶温度升高而降低。合金经1100℃固溶1 h,再经750~900℃时效1 h后,硅化物在晶界处析出,而在700℃和950℃时效1 h的样品中未见硅化物的析出。800~950℃之间时效后的合金强度基本不变,晶界硅化物对合金抗拉强度影响不大,但合金塑性随晶界硅化物含量减少而提高,断裂模式由脆性断裂转变为韧性断裂。
        The dissolution and precipitation behaviors of silicides of Ti-38644 titanium alloy and their influence on the microstructure and tensile properties were investigated.Microstructure characteristics and tensile fracture mode were observed by OM,SEM and TEM.The results show that trace impurity Si promotes the formation of(TiZr)_6Si_(3 )silicides.Silicide gradually dissolves when the alloy is solution treated at 700~950oC.No silicides are observed after the alloy is solution treated at 950oC.The strength of the alloy decreases with the increasing of solution temperature in the range of 800~950oC due to the dissolution of silicides and the growth ofβgrains.When the alloy is solution treated at 1100oC and aged at 750~900oC for 1 h,silicides precipitate at grain boundaries.No grain boundary silicides are observed after the alloy is aged at 700oC and 950oC.Grain boundary silicides have little influence on the strength,but the plasticity of alloys increases with the decreasing of the quantity of grain boundary silicides.The fracture mode transforms from brittle fracture to ductile fracture.

引文

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