Ru对第四代镍基单晶高温合金DD22长期时效组织演化的影响
Effect of Ru on microstructure evolution of the fourth generation nickel-based single crystal superalloy DD22during long-term aging
查看参考文献27篇
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文摘
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利用透射电镜和场发射扫描电镜研究了两种不同Ru含量(3%和5%,质量分数)的第四代镍基单晶高温合金DD22在1130℃长期时效过程中γ′相形貌演化、TCP相析出和界面位错网的演化情况。研究结果表明:在完全热处理后5Ru合金比3Ru合金的γ′相尺寸更小,形状更规则,γ/γ′相界面的错配度更大,高Ru含量使合金Re,Mo等元素出现反分配现象;5Ru合金在1130℃长期时效过程中γ′相粗化速率、溶解速率和形筏速率均低于3Ru合金;5Ru合金在长期时效1000h后仍没有TCP相析出,而3Ru合金在时效50h后便析出TCP相,随着长期时效时间延长,TCP相数量增多,尺寸增大;与3Ru合金相比,长期时效1000h后5Ru合金γ′/γ界面位错网更加致密和规则;综上所述,Ru的元素反分配作用和低的扩散系数使5Ru合金比3Ru合金表现出更高的组织稳定性。 |
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其他语种文摘
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The morphological evolution ofγ′phase,the precipitation of TCP phases and the evolution of the interfacial dislocation networks in DD22nickel-based single crystal superalloys with different Ru contents(3%and 5%,mass fraction)were investigated by transmission electron microscopy and field emission scanning electron microscopy during long-term aging at 1130℃.The results show thatγ′ phase of 5Ru alloy are smaller in size and more regular in shape than that of 3Ru alloy.The mismatch ofγ/γ′phases is larger in 5Ru alloy,and the high content of Ru causes the reverse distribution of elements such as Re and Mo.During long-term aging at 1130℃,the coarsening rate,dissolution rate and rafting rate ofγ′phase in 5Ru alloy are lower than those of 3Ru alloy.There is still no TCP phase precipitation in 5Ru alloy after long-term aging for 1000h,while a small amount of TCP phase is precipitated in 3Ru alloy after long-term aging for 50h.With the prolongation of long-term aging time,the number and size of TCP phases both increase.Compared with 3Ru alloy,the interfacial dislocation networks of 5Ru alloy are denser and more regular after long-term aging for 1000h.Above all,the reverse distribution of elements and low diffusion coefficient of Ru make 5Ru alloy exhibit higher microstructural stability than 3Ru alloy. |
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来源
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材料工程
,2022,50(9):127-136 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000105
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关键词
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DD22镍基单晶高温合金
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Ru含量
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长期时效
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位错网
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组织稳定性
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地址
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1.
中国航发北京航空材料研究院先进高温结构材料重点实验室, 北京, 100095
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陆装驻北京地区航空军代表室, 北京, 100041
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沈阳工业大学材料科学与工程学院, 沈阳, 110870
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:7332148
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