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添加稀土元素Y对Ti2AlNb基合金高温变形行为及热加工工艺的影响

Effect of adding rare earth element Y on high temperature deformation behavior and hot working process of Ti2AlNb based alloy
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摘要 利用Gleeble-3500热模拟试验机对Ti-22Al-24Nb合金和Ti-22Al-24Nb-0. 5Y合金试样进行等温恒应变速率压缩试验,研究了在应变速率0. 01~10 s-1、变形温度900~1080℃条件下,添加稀土Y对Ti-22Al-24Nb合金高温流动应力及热变形激活能的影响规律,采用Prasad加工图分析了添加稀土元素Y对Ti-22Al-24Nb合金热加工工艺的影响。结果表明:添加稀土元素Y后,提高了Ti-22Al-24Nb合金的高温变形抗力和变形激活能,含稀土元素Y的Ti-22Al-24Nb-0. 5Y合金的峰值流动应力在各变形条件下均高于未添加稀土的Ti-22Al-24Nb合金,且随应变量的增加,其激活能升高,应变量为0. 6时,Ti-22Al-24Nb-0. 5Y合金激活能达到了668. 464 k J·mol-1,当应变量为0. 8时,随应变量的增加,合金变形激活能变化不大;添加稀土元素Y对Ti-22Al-24Nb合金加工图的失稳区域及功率耗散效率影响显著,添加稀土元素Y后,合金在加工图中的失稳区域扩大,提高了合金热变形过程中的功率耗散效率,减小了Ti-22Al-24Nb合金热加工工艺参数范围。 The isothermal constant strain rate compression tests of Ti-22 Al-24 Nb alloy and Ti-22 Al-24 Nb-0.5 Y alloy samples were carried out by Gleeble-3500 thermal simulation tester.The effect of rare earth element Y on high temperature flow stress and thermal deformation activation energy of Ti-22 Al-24 Nb alloy at strain rates of 0.01-10 s-1 and deformation temperature of 900-1080℃was studied,and the effect of adding rare earth element Y on hot working process of Ti-22 Al-24 Nb alloy was analyzed by using Prasad processing map.The results show that the addition of rare earth element Y can improve the high temperature deformation resistance and deformation activation energy of the Ti-22 Al-24 Nb alloy.The peak flow stress of the rare Ti-22 Al-24 Nb-0.5 Y alloy is higher than that of the rare earth element free Ti-22 Al-24 Nb alloy under all deformation conditions,and with the increase of the strain,the activation energy of the rare earth free Ti-22 Al-24 Nb0.5 Y alloy increases,when the strain is 0.6,the activation energy reaches 668.464 kJ·mol-1.When the strain is 0.8,the deformation activation energy of Ti-22 Al-24 Nb-0.5 Y alloy changes little with the increase of strain.The addition of rare earth element Y has significant effects on the instability region and power dissipation efficiency of the Ti-22 Al-24 Nb alloy hot processing map.After the rare earth Y is added,the instability region of the alloy in the processing map is enlarged,the power dissipation efficiency in the heat deformation process of the alloy is improved,and the hot processing parameter range of Ti-22 Al-24 Nb alloy is reduced.
作者 周峰 王克鲁 鲁世强 陈虚怀 万鹏 ZHOU Feng;WANG Ke-lu;LU Shi-qiang;CHEN Xu-huai;WAN Peng(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处 《塑性工程学报》 CAS CSCD 北大核心 2019年第3期153-160,共8页 Journal of Plasticity Engineering
基金 国家自然科学基金资助项目(51464035).
关键词 Ti-22Al-24Nb合金 Ti-22Al-24Nb-0. 5Y合金 稀土元素Y 高温变形抗力 变形激活能 热加工工艺 Ti-22Al-24Nb alloy Ti-22Al-24Nb-0.5Y alloy rare earth element Y high temperature deformation resistance deformation activation energy hot working process
作者简介 通讯作者:王克鲁,男,1968年生,博士,教授,主要从事航空材料及难变形材料研究,E-mail:wangkelu@126.com;第一作者:周峰,男,1992年生,硕士,主要从事航空材料研究,E-mail:929399962@qq.com
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