EFFECTS OF DEUTERIUM CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Zr-4 ALLOY

doi:10.11900/0412.1961.2016.00193

Acta Metall Sin

2016, Vol. 52

Issue (12): 1572-1578 DOI: 10.11900/0412.1961.2016.00193

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EFFECTS OF DEUTERIUM CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Zr-4 ALLOY

Cheng ZHANG,Xiping SONG(

),Jingru LIU,Yun YANG,Li YOU

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

Cheng ZHANG,Xiping SONG,Jingru LIU,Yun YANG,Li YOU. EFFECTS OF DEUTERIUM CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Zr-4 ALLOY. Acta Metall Sin, 2016, 52(12): 1572-1578.

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Abstract

Zirconium alloy has been employed widely in nuclear industry, yet the absorption of deuterium in zircaloy is considered to play a critical role in mechanical properties especially in high temperature under a loss of coolant accident (LOCA) and application for deuterium storage. However, little is known about the microstructure evolution of zircaloy during deuterium absorption. In this work, deuterium was charged into the sample at 900oC and different pressures, and the effects of deuterium content on microstructure and mechanical properties of Zr-4 alloy have been studied by means of OM, BSE, SEM, XRD, and hardness and compressive tests. The results showed that the amount of deuteride increased with the increase of deuterium content from 1.35% to 2.21%, accompanying with the morphology variations from intragranular deuteride needles to intergranular deuteride blocks, which formed an interlinked deuteride configuration and grew into equiaxed α-Zr grains. Deuteride layer was observed on the surface of sample at higher deuterium content with the micro-crack appeared within it. The mostly deuteride was δ-deuteride, and ε-deuteride was observed on sample surface with high deuterium content. There existed a hardness gradient from surface to center. With the increase of deuterium content, the hardness increased and hardness gradient became evident. With increasing deuterium content, the compressive yield strength of samples in creased slightly, but the compressive ultimate strength decreased greatly from 1176 MPa (1.35%) to 856 MPa (2.21%). The deceasing of compressive ultimate strength was probably related to the formation of micro-crack. The cracks nucleated and propagated within the intergranular deuteride blocks, which leads to the degradation of compressive ultimate strength.

Key words: zircaloy, deuterium content, microstructure, mechanical property, deuteride

Received: 17 May 2015

Fund: Supported by National Natural Science Foundation of China (Nos.21171018 and 51271021)

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	Cheng ZHANG
	Xiping SONG
	Jingru LIU
	Yun YANG
	Li YOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00193 OR https://www.ams.org.cn/EN/Y2016/V52/I12/1572

Fig.1 OM image of as received Zr-4 alloy (RD—radial direction, TD—axial direction)

Fig.2 Cross section (a) and surface (b) XRD spectra of Zr-4 alloys with different deuterium contents

Fig.3 Cross section OM images of Zr-4 alloys with 1.35% (a), 1.82% (b), 2.09% (c) and 2.21% (d) deuterium

Fig.4 Cross-section BSE images of Zr-4 alloys with 1.35% (a), 1.82% (b), 2.09 % (c) and 2.21% (d) deuterium

Fig.5 Vickers microhardness on cross section of Zr-4 alloys with different deuterium contents (a) and microstructure and microhardness on cross-section with 2.21% deuterium (b)

Fig.6 Compressive stress-strain (σ-ε) (a) and compressive ultimate strength (σ_c) (b) curves of Zr-4 alloys with different deuterium contents

Fig.7 BSE images of Zr-4 alloy with 2.21% deuterium before compression (a) and after compression (b~d) (Figs.7c and d correspond to areas 1 and 2 in Fig.7b, respectively)

Fig.8 Zr-H phase diagram^[11] (Symbols A~D represent the corresponding deuterium content in the diagram, repectively)

Fig.9 Schematic of microstructure evolution of deuterated Zr-4 alloy

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