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Brittle coating effects on fatigue cracks behavior in Ti alloys
Titanium alloy fatigue limit is reduced by brittle coatings. [Display omitted] •Tension-tension fatigue tests of TC4 alloy with brittle coatings were conducted.•Fatigue crack initiated in brittle coatings and propagated to the interface.•The fatigue limit stress is significantly reduced due to the b...
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Published in: | International journal of fatigue 2019-08, Vol.125, p.432-439 |
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container_title | International journal of fatigue |
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creator | Bai, Yanyun Xi, Yeting Gao, Kewei Yang, Huisheng Pang, Xiaolu Yang, Xusheng Volinsky, Alex A. |
description | Titanium alloy fatigue limit is reduced by brittle coatings.
[Display omitted]
•Tension-tension fatigue tests of TC4 alloy with brittle coatings were conducted.•Fatigue crack initiated in brittle coatings and propagated to the interface.•The fatigue limit stress is significantly reduced due to the brittle coatings.•The model of coating cracking-induced fatigue decrease is proposed.
In order to study the coating effects on fatigue crack initiation mechanism in Ti-alloys, two types of brittle coatings, CrAlN and TiN, were deposited on the surface of TC4 titanium alloy by physical vapor deposition. The tension-tension fatigue tests and the in-situ observations of fatigue crack morphology were performed to study the coating effects on the fatigue crack initiation and propagation in the Ti-6Al-4V alloy. It was found that the 510–530 MPa TC4 fatigue limit is reduced to 315–330 MPa due to the CrAlN coating. The brittle coatings impeded the deformation of the TC4 samples at the beginning stage of fatigue tests, while coating cracking promoted the elongation of the tested samples. Fatigue crack was found to be initiated in the brittle coatings and propagated to the coating-substrate interface, inducing micro-damage of the substrate surface. The fracture surface of coated and uncoated samples was quite different, and the formation of non-propagating fatigue cracks was also observed. The coating cracking-induced low cyclic stress substrate damage model was proposed. This study should be of significance for the coating improvement and provides a theoretical basis for improving fatigue properties of coating materials. |
doi_str_mv | 10.1016/j.ijfatigue.2019.04.017 |
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[Display omitted]
•Tension-tension fatigue tests of TC4 alloy with brittle coatings were conducted.•Fatigue crack initiated in brittle coatings and propagated to the interface.•The fatigue limit stress is significantly reduced due to the brittle coatings.•The model of coating cracking-induced fatigue decrease is proposed.
In order to study the coating effects on fatigue crack initiation mechanism in Ti-alloys, two types of brittle coatings, CrAlN and TiN, were deposited on the surface of TC4 titanium alloy by physical vapor deposition. The tension-tension fatigue tests and the in-situ observations of fatigue crack morphology were performed to study the coating effects on the fatigue crack initiation and propagation in the Ti-6Al-4V alloy. It was found that the 510–530 MPa TC4 fatigue limit is reduced to 315–330 MPa due to the CrAlN coating. The brittle coatings impeded the deformation of the TC4 samples at the beginning stage of fatigue tests, while coating cracking promoted the elongation of the tested samples. Fatigue crack was found to be initiated in the brittle coatings and propagated to the coating-substrate interface, inducing micro-damage of the substrate surface. The fracture surface of coated and uncoated samples was quite different, and the formation of non-propagating fatigue cracks was also observed. The coating cracking-induced low cyclic stress substrate damage model was proposed. This study should be of significance for the coating improvement and provides a theoretical basis for improving fatigue properties of coating materials.</description><identifier>ISSN: 0142-1123</identifier><identifier>EISSN: 1879-3452</identifier><identifier>DOI: 10.1016/j.ijfatigue.2019.04.017</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Brittleness ; Coatings ; Crack initiation ; Crack propagation ; Damage assessment ; Deformation mechanisms ; Elongation ; Fatigue crack ; Fatigue cracking ; Fatigue cracks ; Fatigue failure ; Fatigue limit ; Fatigue tests ; Fracture mechanics ; Fracture surfaces ; Initiation mechanism ; Materials fatigue ; Metal fatigue ; Morphology ; Nondestructive testing ; Physical vapor deposition ; Protective coatings ; Stress propagation ; Substrates ; Surface coatings ; Ti alloys ; Titanium alloys ; Titanium base alloys</subject><ispartof>International journal of fatigue, 2019-08, Vol.125, p.432-439</ispartof><rights>2019 Elsevier Ltd</rights><rights>Copyright Elsevier BV Aug 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c458t-278ba8952402b9c6723491a252d0fcd32ea027eb8ae996c7e8086c9ae91a7c8a3</citedby><cites>FETCH-LOGICAL-c458t-278ba8952402b9c6723491a252d0fcd32ea027eb8ae996c7e8086c9ae91a7c8a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Bai, Yanyun</creatorcontrib><creatorcontrib>Xi, Yeting</creatorcontrib><creatorcontrib>Gao, Kewei</creatorcontrib><creatorcontrib>Yang, Huisheng</creatorcontrib><creatorcontrib>Pang, Xiaolu</creatorcontrib><creatorcontrib>Yang, Xusheng</creatorcontrib><creatorcontrib>Volinsky, Alex A.</creatorcontrib><title>Brittle coating effects on fatigue cracks behavior in Ti alloys</title><title>International journal of fatigue</title><description>Titanium alloy fatigue limit is reduced by brittle coatings.
[Display omitted]
•Tension-tension fatigue tests of TC4 alloy with brittle coatings were conducted.•Fatigue crack initiated in brittle coatings and propagated to the interface.•The fatigue limit stress is significantly reduced due to the brittle coatings.•The model of coating cracking-induced fatigue decrease is proposed.
In order to study the coating effects on fatigue crack initiation mechanism in Ti-alloys, two types of brittle coatings, CrAlN and TiN, were deposited on the surface of TC4 titanium alloy by physical vapor deposition. The tension-tension fatigue tests and the in-situ observations of fatigue crack morphology were performed to study the coating effects on the fatigue crack initiation and propagation in the Ti-6Al-4V alloy. It was found that the 510–530 MPa TC4 fatigue limit is reduced to 315–330 MPa due to the CrAlN coating. The brittle coatings impeded the deformation of the TC4 samples at the beginning stage of fatigue tests, while coating cracking promoted the elongation of the tested samples. Fatigue crack was found to be initiated in the brittle coatings and propagated to the coating-substrate interface, inducing micro-damage of the substrate surface. The fracture surface of coated and uncoated samples was quite different, and the formation of non-propagating fatigue cracks was also observed. The coating cracking-induced low cyclic stress substrate damage model was proposed. This study should be of significance for the coating improvement and provides a theoretical basis for improving fatigue properties of coating materials.</description><subject>Brittleness</subject><subject>Coatings</subject><subject>Crack initiation</subject><subject>Crack propagation</subject><subject>Damage assessment</subject><subject>Deformation mechanisms</subject><subject>Elongation</subject><subject>Fatigue crack</subject><subject>Fatigue cracking</subject><subject>Fatigue cracks</subject><subject>Fatigue failure</subject><subject>Fatigue limit</subject><subject>Fatigue tests</subject><subject>Fracture mechanics</subject><subject>Fracture surfaces</subject><subject>Initiation mechanism</subject><subject>Materials fatigue</subject><subject>Metal fatigue</subject><subject>Morphology</subject><subject>Nondestructive testing</subject><subject>Physical vapor deposition</subject><subject>Protective coatings</subject><subject>Stress propagation</subject><subject>Substrates</subject><subject>Surface coatings</subject><subject>Ti alloys</subject><subject>Titanium alloys</subject><subject>Titanium base alloys</subject><issn>0142-1123</issn><issn>1879-3452</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LAzEQhoMoWKu_wYDnXSfZjyQnqcUvKHip55DNztasdVOTbaH_3pQWr56Ggfd9hnkIuWWQM2D1fZ-7vjOjW20x58BUDmUOTJyRCZNCZUVZ8XMyAVbyjDFeXJKrGHsAUCCqCXl4DG4c10itT4xhRbHr0I6R-oGeqNQGY78ibfDT7JwP1A106ahZr_0-XpOLzqwj3pzmlHw8Py3nr9ni_eVtPltktqzkmHEhGyNVxUvgjbK14EWpmOEVb6GzbcHRABfYSINK1VagBFlblTZmhJWmmJK7I3cT_M8W46h7vw1DOqk5r1RRSikgpcQxZYOPMWCnN8F9m7DXDPTBlu71ny19sKWh1MlWas6OTUxP7BwGHa3DwWLrQvKhW-_-ZfwCKK52pA</recordid><startdate>201908</startdate><enddate>201908</enddate><creator>Bai, Yanyun</creator><creator>Xi, Yeting</creator><creator>Gao, Kewei</creator><creator>Yang, Huisheng</creator><creator>Pang, Xiaolu</creator><creator>Yang, Xusheng</creator><creator>Volinsky, Alex A.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>201908</creationdate><title>Brittle coating effects on fatigue cracks behavior in Ti alloys</title><author>Bai, Yanyun ; Xi, Yeting ; Gao, Kewei ; Yang, Huisheng ; Pang, Xiaolu ; Yang, Xusheng ; Volinsky, Alex A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c458t-278ba8952402b9c6723491a252d0fcd32ea027eb8ae996c7e8086c9ae91a7c8a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Brittleness</topic><topic>Coatings</topic><topic>Crack initiation</topic><topic>Crack propagation</topic><topic>Damage assessment</topic><topic>Deformation mechanisms</topic><topic>Elongation</topic><topic>Fatigue crack</topic><topic>Fatigue cracking</topic><topic>Fatigue cracks</topic><topic>Fatigue failure</topic><topic>Fatigue limit</topic><topic>Fatigue tests</topic><topic>Fracture mechanics</topic><topic>Fracture surfaces</topic><topic>Initiation mechanism</topic><topic>Materials fatigue</topic><topic>Metal fatigue</topic><topic>Morphology</topic><topic>Nondestructive testing</topic><topic>Physical vapor deposition</topic><topic>Protective coatings</topic><topic>Stress propagation</topic><topic>Substrates</topic><topic>Surface coatings</topic><topic>Ti alloys</topic><topic>Titanium alloys</topic><topic>Titanium base alloys</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bai, Yanyun</creatorcontrib><creatorcontrib>Xi, Yeting</creatorcontrib><creatorcontrib>Gao, Kewei</creatorcontrib><creatorcontrib>Yang, Huisheng</creatorcontrib><creatorcontrib>Pang, Xiaolu</creatorcontrib><creatorcontrib>Yang, Xusheng</creatorcontrib><creatorcontrib>Volinsky, Alex A.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>International journal of fatigue</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bai, Yanyun</au><au>Xi, Yeting</au><au>Gao, Kewei</au><au>Yang, Huisheng</au><au>Pang, Xiaolu</au><au>Yang, Xusheng</au><au>Volinsky, Alex A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Brittle coating effects on fatigue cracks behavior in Ti alloys</atitle><jtitle>International journal of fatigue</jtitle><date>2019-08</date><risdate>2019</risdate><volume>125</volume><spage>432</spage><epage>439</epage><pages>432-439</pages><issn>0142-1123</issn><eissn>1879-3452</eissn><abstract>Titanium alloy fatigue limit is reduced by brittle coatings.
[Display omitted]
•Tension-tension fatigue tests of TC4 alloy with brittle coatings were conducted.•Fatigue crack initiated in brittle coatings and propagated to the interface.•The fatigue limit stress is significantly reduced due to the brittle coatings.•The model of coating cracking-induced fatigue decrease is proposed.
In order to study the coating effects on fatigue crack initiation mechanism in Ti-alloys, two types of brittle coatings, CrAlN and TiN, were deposited on the surface of TC4 titanium alloy by physical vapor deposition. The tension-tension fatigue tests and the in-situ observations of fatigue crack morphology were performed to study the coating effects on the fatigue crack initiation and propagation in the Ti-6Al-4V alloy. It was found that the 510–530 MPa TC4 fatigue limit is reduced to 315–330 MPa due to the CrAlN coating. The brittle coatings impeded the deformation of the TC4 samples at the beginning stage of fatigue tests, while coating cracking promoted the elongation of the tested samples. Fatigue crack was found to be initiated in the brittle coatings and propagated to the coating-substrate interface, inducing micro-damage of the substrate surface. The fracture surface of coated and uncoated samples was quite different, and the formation of non-propagating fatigue cracks was also observed. The coating cracking-induced low cyclic stress substrate damage model was proposed. This study should be of significance for the coating improvement and provides a theoretical basis for improving fatigue properties of coating materials.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijfatigue.2019.04.017</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Brittleness Coatings Crack initiation Crack propagation Damage assessment Deformation mechanisms Elongation Fatigue crack Fatigue cracking Fatigue cracks Fatigue failure Fatigue limit Fatigue tests Fracture mechanics Fracture surfaces Initiation mechanism Materials fatigue Metal fatigue Morphology Nondestructive testing Physical vapor deposition Protective coatings Stress propagation Substrates Surface coatings Ti alloys Titanium alloys Titanium base alloys |
title | Brittle coating effects on fatigue cracks behavior in Ti alloys |
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