Creep Mechanism of Biodegradable Zn-0.45Mn Alloy in Temperature Range of 37-121 oC

doi:10.11901/1005.3093.2025.094

Chinese Journal of Materials Research

2025, Vol. 39

Issue (12): 881-891 DOI: 10.11901/1005.3093.2025.094

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Creep Mechanism of Biodegradable Zn-0.45Mn Alloy in Temperature Range of 37-121 ^oC

SUN Tao¹^,², TANG Lebin², ZHU Xinglong², YANG Lijing²(

), ZHANG Qingke², SONG Zhenlun²

^1.College of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
^2.State Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Cite this article:

SUN Tao, TANG Lebin, ZHU Xinglong, YANG Lijing, ZHANG Qingke, SONG Zhenlun. Creep Mechanism of Biodegradable Zn-0.45Mn Alloy in Temperature Range of 37-121 ^oC. Chinese Journal of Materials Research, 2025, 39(12): 881-891.

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Abstract

Zn-0.45Mn alloy was prepared by melt casting and hot extrusion, and the creep behavior of Zn-0.45Mn alloy was investigated at the temperature range of 37-121 ^oC and by stress in the range of 40 MPa to 170 MPa. Under the low stress condition of 40 MPa, the creep characteristics of Zn-0.45Mn alloy showed creep stress exponent of 5.44, 5.08, and 4.33, corresponding to test temperature at 37 ^oC, 51 ^oC and 121 ^oC respectively. The apparent creep activation energy was calculated to be 24.1-42.1 kJ/mol. In combination with microstructural analysis, the grain boundary slippage may be the main creep mechanism, especially at high temperatures. The results not only reveal the creep behavior of Zn-0.45Mn alloy, but also provide a scientific basis for expanding their potential in biomedical applications.

Key words: non-ferrous metals and their alloys Zn-Mn alloy creep stress exponent apparent creep activation energy

Received: 03 March 2025

ZTFLH:

TG146.1

Fund: Key Research and Development Program of Zhejiang Province(2024C03078);Ningbo International R & D Collaboration Project(2023H022);Ningbo Youth Science and Technology Innovation Leading Talent Project(2023QL014)

Corresponding Authors: YANG Lijing, Tel: 15267855738, E-mail: yanglj@nimte.ac.cn

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	SUN Tao
	TANG Lebin
	ZHU Xinglong
	YANG Lijing
	ZHANG Qingke
	SONG Zhenlun

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https://www.cjmr.org/EN/10.11901/1005.3093.2025.094 OR https://www.cjmr.org/EN/Y2025/V39/I12/881

Fig.1 Experimental process flow for preparation and property testing of Zn -0.45Mn alloy

Table 1 Chemical composition of Zn-0.45Mn alloy

Fig.2 XRD characterization of Zn-0.45Mn alloy

Fig.3 Microstructure of Zn-0.45Mn alloy in the perpendicular and parallel to the extrusion direction (a, e) Schematic of the observation locations, (b, f) Optical micrographs of Zn-0.45Mn alloy perpendicular to and parallel to the extrusion direction, with ED indicating the extrusion direction, (c) SEM image perpendicular to the extrusion direction, (d) High magnification image of the green box area in (c), (c'-d') BSE images of (c-d), (g) SEM image parallel to the extrusion direction, (h) High magnification image of the yellow box area in (g), (g'-h') BSE images of (g-h)

Table 2 EDS analysis results at different positions perpendicular to and parallel to the extrusion direction

Fig.4 Tensile stress-strain curve (a), macroscopic morphology of tensile fracture (b) and an enlarged view of the center of the fracture in Fig.4b (c)

Fig.5 Creep curves at room temperature (a) and at 37-121 ^oC (b-d) under various stresses

Fig.6 Creep strain versus time curves of Zn-0.45Mn alloy at 70 MPa, 37-121 ^oC, showing the initial creep stage (Ⅰ), steady state creep stage (Ⅱ) and final creep stage (Ⅲ)

Fig.7 Fracture morphologies of Zn-0.45Mn alloy after creep rupture under various stresses at 37 ^oC, 51 ^oC, and 121 ^oC (No rupture occurred after 1000 h of creep at 37 ^oC and 51 ^oC under 40 MPa)

Fig.8 Relationship between the steady-state creep rate and applied stress for Zn-0.45Mn alloy at 37 ^oC, 51 ^oC, and 121 ^oC

Fig.9 Creep fracture behavior at different temperatures (a) relationship between fracture time and applied stress, (b) relationship between fracture time and minimum creep rate

Fig.10 Creep stress exponent n at 37 ^oC, 51 ^oC, and 121 ^oC

Fig.11 Logarithm of steady state creep rate ( $l n ε ˙$ ) versus the reciprocal of temperature (1000/T) under different stress levels (a), activation energy under different stress levels (b)

Fig.12 Longitudinal section of Zn-0.45Mn alloy after creep rupture at 70 MPa and 37 ^oC

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