Article(id=1289282149937423300, tenantId=1146029695717560320, journalId=1287019424739590152, issueId=1289282136750539420, articleNumber=null, orderNo=null, doi=10.12442/j.issn.1002-185X.20250151, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1753027200000, receivedDateStr=2025-07-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1785318418249, onlineDateStr=2026-07-29, pubDate=1783612800000, pubDateStr=2026-07-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1785318418249, onlineIssueDateStr=2026-07-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1785318418249, creator=13701087609, updateTime=1785318418249, updator=13701087609, issue=Issue{id=1289282136750539420, tenantId=1146029695717560320, journalId=1287019424739590152, year='2026', volume='55', issue='7', pageStart='1701', pageEnd='1848', issueExtLink='null', onlineDate='null', pubDate='1783612800000', pubDateStr='2026-07-10', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1785318415105, creator='13701087609', updateTime=1785389094930, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1289578589494555490, tenantId=1146029695717560320, journalId=1287019424739590152, issueId=1289282136750539420, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1289578589498749795, tenantId=1146029695717560320, journalId=1287019424739590152, issueId=1289282136750539420, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1766, endPage=1774, ext={EN=ArticleExt(id=1289282150109389765, articleId=1289282149937423300, tenantId=1146029695717560320, journalId=1287019424739590152, language=EN, title=High-Temperature Compression Creep Behaviour and Mechanism of Ti-47.5Al-6.8Nb-0.2W-xY Alloy by Spark Plasma Sintering, columnId=null, journalTitle=Rare Metal Materials and Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Ti-47.5Al-6.8Nb-0.2W-xY (x=0,0.1,0.2, at%) alloys were prepared by high-energy ball milling and spark plasma sintering processes, and the effects of Y microalloying on the high-temperature compression creep properties of Ti-47.5Al-6.8 Nb-0.2W alloys were investigated by SEM, EBSD and TEM. Creep experiments were carried out at 800-850 ℃, with a stress of 250 MPa and a time of 50 h. The results show that the Ti-47.5Al-6.8Nb-0.2W-xY alloys are all composed of equiaxial γ grains, the bulk α₂ and B2 phases at γ grain boundaries, and α₂/γ lamellar colonies. The added Y mainly exists in the form of Al₂Y particles at the grain boundaries to form a chain structure and Y can refine the grains and increase the α₂/γ lamellar colonies. When the Y content is increased from 0 to 0.2at%, the grain size is reduced from 12.1 μm to 7.8 μm, exhibiting the most significant refining effect. After creep, γ grains in the alloy are slightly flattened, accompanied by lamellar bending and degradation phenomena, and a large number of fine recrystallized grains and spherical B2 phase appear within the lamellar clusters. Creep temperature increase can promote the formation of dynamic recrystallisation. The addition of Y significantly improves the compressive creep properties of the alloy. At 800 ℃, the maximum creep strain of the 0.2Y alloy is 8.96%, and the steady creep rate is 4.01×10^-7 s^-1, reduced by 32.83% and 38.31% compared with those of the alloy without Y, respectively. The improvement in the mechanical properties of the alloys is attributed to the precipitation strengthening of the second phase Al₂Y particles, lamellar refinement, and reduction of the B2 phase.

, authors=Hongbao Yu^{1, 2}, Yujun Zhou¹, Hongyan Yu^{1, 2}, Shulong Xiao³, Bin Tang⁴, Zhao Lu^{1, 2}, authorsList=Hongbao Yu, Yujun Zhou, Hongyan Yu, Shulong Xiao, Bin Tang, Zhao Lu, authorCompany=null, correspAuthors=Hongyan Yu, authorNote=null, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1289282150352659398, articleId=1289282149937423300, tenantId=1146029695717560320, journalId=1287019424739590152, language=CN, title=放电等离子烧结Ti-47.5Al-6.8Nb-0.2W-xY合金高温压缩蠕变行为及机理研究, columnId=1289282137585205918, journalTitle=稀有金属材料与工程, columnName=材料科学, runingTitle=null, highlight=null, articleAbstract=

采用高能球磨（high-energy ball milling, HEM）和放电等离子烧结（spark plasma sintering, SPS）工艺制备Ti-47.5Al-6.8Nb-0.2W-xY（x=0，0.1，0.2，at%）合金，通过SEM、EBSD、TEM等研究Y微合金化对Ti-47.5Al-6.8 Nb-0.2W合金高温压缩蠕变性能的影响，分别在800~850 ℃进行蠕变试验，应力为250 MPa，时间为50 h。结果表明：Ti-47.5Al-6.8Nb-0.2W-xY合金均由等轴γ晶粒、γ晶界的块状α₂和B2相、α₂/γ片层团组成。添加的Y主要以Al₂Y颗粒的形式在晶界处形成链状结构，Y能细化晶粒并增大α₂/γ片层团，Y含量由0增至0.2at%时，晶粒尺寸从12.1 μm减小至7.8 μm，细化效果最为显著。在蠕变后合金中γ晶粒轻微扁平化，片层发生弯曲和退化现象，片层团内部出现大量细小的再结晶晶粒及球状B2相，蠕变温度升高促进动态再结晶形成。Y的加入显著提高合金的压缩蠕变性能，在800 ℃下，0.2Y合金的最大蠕变应变为8.96%，稳态蠕变速率为4.01×10^-7 s^-1，与无Y合金相比分别降低了32.83%和38.31%。合金力学性能的改善是由于Al₂Y颗粒的第二相强化、片层细化和B2相的减少。

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于宏宝，男，1977年生，博士，桂林电子科技大学材料科学与工程学院，广西 桂林 541004，电话：0773-2291434，E-mail: yuhongbao@guet.edu.cn

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于宏宝，男，1977年生，博士，桂林电子科技大学材料科学与工程学院，广西 桂林 541004，电话：0773-2291434，E-mail: yuhongbao@guet.edu.cn

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