Hydrogen-prompted heterogeneous development of dislocation structure in Ni

Sun, Qingqing1,2,4; He, Jing1; Nagao, Akihide3; Ni, Yong4; Wang, Shuai1

2023-03-01

10.1016/j.actamat.2022.118660

ACTA MATERIALIA   Impact Factor & Quartile

1359-6454

1873-2453

First documented in 1875, the deterioration of mechanical properties of hydrogen-containing metals is a long-standing yet unsolved problem in materials science. In this work, the evolution of dislocation structures in differently orientated grains (i.e., near [100], [110], and [111]) of the uncharged and hydrogen-charged (400 and 1200 ppm) polycrystalline Ni were systematically investigated by combining electron backscatter diffrac-tion, focused ion beam and scanning transmission electron microscopy. By using site-specific characterization methods, for the first time, we discover that hydrogen-enhanced localized plasticity (HELP) is orientation-dependent, with the following sequence: [100] > [111] > [110]. Massive incompatibility between differently orientated grains, induced by the orientation dependence of HELP, contributes to the premature intergranular fracture of Ni, especially for the 400 ppm H-charged Ni. Our results suggest that optimizing orientation distri-bution is a potential approach for enhancing metals' resistance to hydrogen damage. The relative contribution of HELP and hydrogen-enhanced decohesion (HEDE) mechanisms in hydrogen embrittlement of Ni is also analyzed quantitatively for 400 and 1200 ppm H-charged samples. In the 400 ppm H-charged Ni, a strong synergistic interaction exists between HELP and HEDE mechanisms, and the HELP mechanism plays a critical role in pre-mature fracture. By contrast, in the 1200 ppm H-charged Ni, the HELP effect on final failure is much less sig-nificant and HEDE is the dominant embrittlement mechanism.

Hydrogen-enhanced localized plasticity Dislocation Orientation dependence Ni

SCI

English

First ; Corresponding

National Key R & D Program of China[2022YFB4600700] ; Key-Area Project of the Guangdong Province Department of Education[2022ZDZX3021] ; Shenzhen Science and Technology Innovation Commission[JCYJ20210324104414040] ; National Natural Science Foundation of China[52101115] ; Song- shan Lake Materials Laboratory Open Project Foundation[2021SLABFN13]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000921587900001

PERGAMON-ELSEVIER SCIENCE LTD

MATERIALS SCIENCE

2-s2.0-85145664700

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Sun Yat Sen Univ, Sch Mat, Shenzhen 518107, Guangdong, Peoples R China
3.Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, 744 Moto Oka,Nishi Ku, Fukuoka, Fukuoka 8190395, Japan
4.Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Anhui, Peoples R China

Sun, Qingqing,He, Jing,Nagao, Akihide,et al. Hydrogen-prompted heterogeneous development of dislocation structure in Ni[J]. ACTA MATERIALIA,2023,246.

Sun, Qingqing,He, Jing,Nagao, Akihide,Ni, Yong,&Wang, Shuai.(2023).Hydrogen-prompted heterogeneous development of dislocation structure in Ni.ACTA MATERIALIA,246.

Sun, Qingqing,et al."Hydrogen-prompted heterogeneous development of dislocation structure in Ni".ACTA MATERIALIA 246(2023).