Article(id=1304141620685861660, tenantId=1146029695717560320, journalId=1303687303576780880, issueId=1304141619603726817, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1009-3842.2026.01.005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1740326400000, receivedDateStr=2025-02-24, revisedDate=1767628800000, revisedDateStr=2026-01-06, acceptedDate=null, acceptedDateStr=null, onlineDate=1788861192150, onlineDateStr=2026-09-08, pubDate=1772208000000, pubDateStr=2026-02-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1788861192150, onlineIssueDateStr=2026-09-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1788861192150, creator=13701087609, updateTime=1788861192150, updator=13701087609, issue=Issue{id=1304141619603726817, tenantId=1146029695717560320, journalId=1303687303576780880, year='2026', volume='', issue='1', pageStart='1', pageEnd='154', issueExtLink='null', onlineDate='null', pubDate='1772208000000', pubDateStr='2026-02-28', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1788861191893, creator='13701087609', updateTime=1788924965522, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1304409105645465969, tenantId=1146029695717560320, journalId=1303687303576780880, issueId=1304141619603726817, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1304409105645465970, tenantId=1146029695717560320, journalId=1303687303576780880, issueId=1304141619603726817, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=48, endPage=58, ext={EN=ArticleExt(id=1304141620975268637, articleId=1304141620685861660, tenantId=1146029695717560320, journalId=1303687303576780880, language=EN, title=Microscopic Characteristics of Copper Conductors in Fire Scenarios, columnId=1304141568877814747, journalTitle=Copper Engineering, columnName=Material Preparation and Process Engineering, runingTitle=null, highlight=null, articleAbstract=

To prevent fire incidents, investigating fire traces and identifying the cause of the fire is a primary task in fire forensic evidence identification. Analysis of microscopic characteristics of copper conductors after a fire is an effective method for this purpose. This study simulated the temperature, time, and atmospheric conditions of a fire environment, generating fires caused by overcurrent faults, to investigate surface morphology, cross-sectional grain shape, and size of copper conductors after a fire. As the temperature increased and duration extended, oxidation degree of the copper conductor deepened, and grains continuously grew, exhibiting an axial shape. At 400 ℃, the grain size was 7~11 μm. At 600 ℃, it increased to 8~14 μm. At 800 ℃, it reached 13~17 μm. During the grain growth process, a large number of twins appeared due to low stacking fault energy. Average grain size of copper conductors was directly proportional to both annealing temperature and time, with temperature having a more significant impact. Linear fitting results showed that activation energy for grain boundary migration during grain growth was 0.68 kJ/mol. Under actual overcurrent fault conditions, the failure copper conductor formed molten beads and dendrites at the fracture site, indicating that an excessive current in the circuit caused the conductor to overheat, ultimately leading to fracture, with abnormal grain growth occurring near fracture zone.

, authors=Xintan BAI¹, Dandan ZHAO¹, Peizhong FENG^{1, 2}, Baojing ZHANG¹, Xiaohong WANG¹, authorsList=Xintan BAI, Dandan ZHAO, Peizhong FENG, Baojing ZHANG, Xiaohong WANG, authorCompany=null, correspAuthors=Xiaohong WANG, authorNote=null, correspAuthorsNote=null, 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=1304141621424059166, articleId=1304141620685861660, tenantId=1146029695717560320, journalId=1303687303576780880, language=CN, title=模拟火灾环境下铜导线微观组织演变特征研究, columnId=1304141569037198301, journalTitle=铜业工程, columnName=材料制备与加工工程, runingTitle=null, highlight=null, articleAbstract=

为准确认定火灾起因并预防类似事故，对火灾后纯铜导线微观组织进行特征分析是物证鉴定的有效方法之一。本研究通过模拟火灾环境下的温度、时间和气氛条件，并施加过电流故障，研究火灾中铜导线的外表面形貌、横截面晶粒形态和尺寸等特征演变规律。结果表明：随着温度的升高和时间的延长，铜导线的氧化程度加剧，铜导线中晶粒不断长大且多呈现等轴晶形态，其中400 ℃时晶粒尺寸为7~11 μm，600 ℃时增至8~14 μm，800 ℃时为13~17 μm，晶粒在生长过程中由于低层错能而出现大量孪晶。铜导线的平均晶粒尺寸与退火温度、时间呈正相关，其中温度效应更为显著。线性拟合结果表明，晶粒长大过程中晶界迁移的激活能为0.68 kJ/mol。在实际过电流故障下，失效铜导线的熔断处形成熔珠和树枝晶，表明电流过大引发导线出现过热现象导致熔断，熔断区附近晶粒异常长大。

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柏鑫坛（2000―），男，山西临汾人，硕士研究生，研究方向：清洁能源技术，E-mail：bxtyxs@163.com

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柏鑫坛（2000―），男，山西临汾人，硕士研究生，研究方向：清洁能源技术，E-mail：bxtyxs@163.com

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