Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys

The effects of Al and Mo elements on the microstructure and hardness of TNM TiAl alloys (Ti-43.5Al-4Nb-1Mo-0.1B) were studied by decreasing 0.5 at.% Mo and/or increasing 1.5 at.% Al. The results showed that the changed composition of the alloy had a slight influence on the morphology, but had import...

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Autores principales:	Gang Yang, Xiangjun Xu, Yongfeng Liang, Yongsheng Wang, Guojian Hao, Yuewen Zhai, Junpin Lin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	TNM alloy microstructure composition hardness Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/dc283b0b82c74a038d9160499017d905
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spelling	oai:doaj.org-article:dc283b0b82c74a038d9160499017d9052021-11-25T18:22:23ZEffects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys10.3390/met111118492075-4701https://doaj.org/article/dc283b0b82c74a038d9160499017d9052021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1849https://doaj.org/toc/2075-4701The effects of Al and Mo elements on the microstructure and hardness of TNM TiAl alloys (Ti-43.5Al-4Nb-1Mo-0.1B) were studied by decreasing 0.5 at.% Mo and/or increasing 1.5 at.% Al. The results showed that the changed composition of the alloy had a slight influence on the morphology, but had important effects on the volume fraction, size, and composition of each phase. All the alloys had nearly full lamellar (NL) microstructures, with a few β<sub>o</sub> phases at the boundaries of the colony or in the lamellar colony. The lamellar colony size and the lamellar spacing increased with the decrease in Mo and the increase in Al. The reduction in Mo content reduced the content of each phase in proportion, but the increase in Al content in the alloys led to the corresponding increase in Al content in the α<sub>2</sub> and γ phases. The hardness of the alloys decreased with the increase in Al content and the decrease in Mo content. This is mainly due to the increase in lamellar spacing caused by the change in composition. Therefore, the increased content of Al and decreased Mo content are unbeneficial for the microstructure. The relationship between the Vickers hardness and the lamellar spacing obeyed the Hall–Petch relationship.Gang YangXiangjun XuYongfeng LiangYongsheng WangGuojian HaoYuewen ZhaiJunpin LinMDPI AGarticleTNM alloymicrostructurecompositionhardnessMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1849, p 1849 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	TNM alloy microstructure composition hardness Mining engineering. Metallurgy TN1-997
spellingShingle	TNM alloy microstructure composition hardness Mining engineering. Metallurgy TN1-997 Gang Yang Xiangjun Xu Yongfeng Liang Yongsheng Wang Guojian Hao Yuewen Zhai Junpin Lin Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
description	The effects of Al and Mo elements on the microstructure and hardness of TNM TiAl alloys (Ti-43.5Al-4Nb-1Mo-0.1B) were studied by decreasing 0.5 at.% Mo and/or increasing 1.5 at.% Al. The results showed that the changed composition of the alloy had a slight influence on the morphology, but had important effects on the volume fraction, size, and composition of each phase. All the alloys had nearly full lamellar (NL) microstructures, with a few β<sub>o</sub> phases at the boundaries of the colony or in the lamellar colony. The lamellar colony size and the lamellar spacing increased with the decrease in Mo and the increase in Al. The reduction in Mo content reduced the content of each phase in proportion, but the increase in Al content in the alloys led to the corresponding increase in Al content in the α<sub>2</sub> and γ phases. The hardness of the alloys decreased with the increase in Al content and the decrease in Mo content. This is mainly due to the increase in lamellar spacing caused by the change in composition. Therefore, the increased content of Al and decreased Mo content are unbeneficial for the microstructure. The relationship between the Vickers hardness and the lamellar spacing obeyed the Hall–Petch relationship.
format	article
author	Gang Yang Xiangjun Xu Yongfeng Liang Yongsheng Wang Guojian Hao Yuewen Zhai Junpin Lin
author_facet	Gang Yang Xiangjun Xu Yongfeng Liang Yongsheng Wang Guojian Hao Yuewen Zhai Junpin Lin
author_sort	Gang Yang
title	Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
title_short	Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
title_full	Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
title_fullStr	Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
title_full_unstemmed	Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys
title_sort	effects of al and mo on microstructure and hardness of as-cast tnm tial alloys
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/dc283b0b82c74a038d9160499017d905
work_keys_str_mv	AT gangyang effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT xiangjunxu effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT yongfengliang effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT yongshengwang effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT guojianhao effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT yuewenzhai effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys AT junpinlin effectsofalandmoonmicrostructureandhardnessofascasttnmtialalloys
_version_	1718411289500319744

Effects of Al and Mo on Microstructure and Hardness of As-Cast TNM TiAl Alloys

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