{"title":"Fractographic Features of Ultrafine-Grained Metals After Tension Accompanied by Pulse Current","authors":"V. V. Stolyarov","doi":"10.1007/s11041-025-01101-0","DOIUrl":null,"url":null,"abstract":"<p>The microrelief of samples of pure titanium and aluminum in single-crystal, coarse-grained and ultrafine- grained states subjected to tension accompanied by different modes of pulse current is studied using scanning electron microscopy. It is shown that the metals in all the states studied fracture by a ductile mechanism characterized by a dimple-cup fracture pattern. A common feature of the single-crystal and coarse-grained states is a microrelief bearing shear bands and large cups, while the ultrafine-grained state is characterized by dimples on the fracture surface. The dimple size does not correlate with the grain size but depends on the intensity of the pulse current and on the microporosity arising during the refinement of the structure.</p>","PeriodicalId":701,"journal":{"name":"Metal Science and Heat Treatment","volume":"66 11-12","pages":"661 - 670"},"PeriodicalIF":0.5000,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metal Science and Heat Treatment","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11041-025-01101-0","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
The microrelief of samples of pure titanium and aluminum in single-crystal, coarse-grained and ultrafine- grained states subjected to tension accompanied by different modes of pulse current is studied using scanning electron microscopy. It is shown that the metals in all the states studied fracture by a ductile mechanism characterized by a dimple-cup fracture pattern. A common feature of the single-crystal and coarse-grained states is a microrelief bearing shear bands and large cups, while the ultrafine-grained state is characterized by dimples on the fracture surface. The dimple size does not correlate with the grain size but depends on the intensity of the pulse current and on the microporosity arising during the refinement of the structure.
期刊介绍：
Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering.
Topics covered include:
New structural, high temperature, tool and precision steels;
Cold-resistant, corrosion-resistant and radiation-resistant steels;
Steels with rapid decline of induced properties;
Alloys with shape memory effect;
Bulk-amorphyzable metal alloys;
Microcrystalline alloys;
Nano materials and foam materials for medical use.
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