{"id":6101,"date":"2021-11-15T22:17:59","date_gmt":"2021-11-15T22:17:59","guid":{"rendered":"https:\/\/staging.asminternational.org\/edfas\/ceramics-can-self-heal-cracks-even-at-room-temperature\/"},"modified":"2023-02-23T21:29:44","modified_gmt":"2023-02-23T21:29:44","slug":"ceramics-can-self-heal-cracks-even-at-room-temperature","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/edfas\/results\/-\/journal_content\/56\/10192\/46253867\/NEWS\/","title":{"rendered":"Ceramics can self-heal cracks even at room temperature"},"content":{"rendered":"

Researchers at Texas A&M University, College Station, Texas, discovered a unique self-healing mechanism within a new type of engineered ceramic; once cracks form in a stressed material, its layers rotate to form a kink band in order to close the cracks, allowing the material to heal itself under stress.<\/p>\n

The self-healing mechanism, called MAX phases, occurs in these ceramics that form natural faults or kink-bands during loading. It can not only effectively stop cracks from growing, but can also close and heal them, thereby preventing catastrophic failure.<\/p>\n

\u201cWhat\u2019s really exciting about MAX phases is that they readily form kink-bands under loading which can self-heal cracks even at room temperature, making them suitable for a variety of advanced structural applications,\u201d said Ankit Srivastava, assistant professor in the Department of Materials Science and Engineering, and a corresponding author on the study published in Science Advances.<\/p>\n

\u201cSo far, self-healing of cracks in ceramics has only been achieved at very high-temperatures by oxidation, and that is why self-healing of cracks at room-temperature by kink-band formation is remarkable.\u201d<\/p>\n

This remarkable behavior of MAX phases can be traced back to their atomically layered structures. The researchers investigated if this unique layered structure of MAX phases make them any different from conventional ceramics, which are resilient to heat and extreme environments but are fragile and crack easily.<\/p>\n

For their experiments, they used single crystal samples of chromium aluminum carbide MAX phase synthesized at the Universit\u00e9 Grenoble Alpes, France, and loaded them inside an electron microscope using an in-house designed test fixture.<\/p>\n

When the researchers viewed the deforming sample in the electron microscope while applying loading, they observed that there were kink-band like defects that formed in the material, resembling those formed in natural rocks. More interestingly, they discovered that the material within kink-bands rotate during loading which not only form barrier against crack propagation but also eventually close and heal the cracks. As a consequence, the sample was no longer vulnerable to catastrophic failure.<\/p>\n

The kinking or self-healing could occur repeatedly, closing the newly formed cracks, delaying the failure of the material.<\/p>\n

The current discovery that materials resilient to heat and extreme environments such as MAX phases, also self-heal cracks which may form during service can advance a host of next-generation technologies, for instance, efficient jet engines, hypersonic flights, and safer nuclear reactors. The researchers also noted in the current study that the kink-band induced self-healing of cracks is most likely not unique to MAX phases and can be extended to other materials with similar atomically layered structures.<\/p>\n

Before this study, self-healing was demonstrated in soft materials and polymer composites. Now, remarkably, it has been seen in ceramics.<\/p>\n

 <\/p>\n

 <\/p>\n

Image – Hemant Rathod observes a sample of chromium aluminum carbide before loading it into the scanning electron microscope. Courtesy of: Dharmesh Patel<\/em><\/p>\n

 <\/p>\n

 <\/p>\n

For more information:<\/p>\n

 <\/p>\n

Texas A&M University<\/p>\n

https:\/\/www.tamu.edu\/<\/a><\/p>\n

 <\/p>\n

Video of self healing<\/p>\n

https:\/\/www.youtube.com\/watch?v=JuRvo-Nf90c<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Researchers at Texas A&M University, College Station, Texas, discovered a unique self-healing mechanism within a new type of engineered ceramic; once cracks form in a stressed material, its layers rotate to form a kink band in order to close the cracks, allowing the material to heal itself under stress.<\/p>\n","protected":false},"author":63103,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[441,437,435,436,1],"tags":[],"class_list":["post-6101","post","type-post","status-publish","format-standard","hentry","category-materials-properties-and-performance","category-materials-testing-and-evaluation","category-news","category-news-articles","category-uncategorized"],"yoast_head":"\nCeramics can self-heal cracks even at room temperature - Electronic Device Failure Analysis Society<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.asminternational.org\/edfas\/results\/-\/journal_content\/56\/10192\/46253867\/NEWS\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ceramics can self-heal cracks even at room temperature - 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