PRECIPITATION KINETICS AND YIELD STRENGTH MODEL FOR NZ30K-Mg ALLOY

doi:10.3724/SP.J.1037.2013.00478

Acta Metall Sin

2014, Vol. 50

Issue (3): 355-360 DOI: 10.3724/SP.J.1037.2013.00478

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PRECIPITATION KINETICS AND YIELD STRENGTH MODEL FOR NZ30K-Mg ALLOY

WANG Xiaona¹, HAN Lizhan^1,², GU Jianfeng^1,²(

)

1 School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240
2 Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai 200240

Cite this article:

WANG Xiaona, HAN Lizhan, GU Jianfeng. PRECIPITATION KINETICS AND YIELD STRENGTH MODEL FOR NZ30K-Mg ALLOY. Acta Metall Sin, 2014, 50(3): 355-360.

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Abstract

Age-hardening effect is considerably strong in magnesium alloys containing Nd, making it possible to develop magnesium alloys with low cost and high strength. Although there have been massive researches about the precipitation product sequence and strengthening models in magnesium, aluminum and other light alloys during their ageing processes, those of NZ30K-Mg alloy, a newly-developed magnesium alloy, has not been carefully investigated. The present work mainly focuses on the model of precipitation kinetics and strengthening of NZ30K-Mg alloy. The precipitation kinetics has been investigated using electrical resistivity testing during continuous heating with different heating rates and formulated based on the isoconversional method. Two related model parameters, modified pre-exponential factor $A' α r$ and activation energy $E α r$ were respectively determined. The precipitation behavior of NZ30K-Mg alloy during ageing processes can also be intrinsically explained from the variations of $E α r$ and ln $A' α r$ with the precipitation fraction. This kinetics model with two above-mentioned parameters can accurately describe the precipitation of strengthening phase during different ageing processes. The yield strength of under-aged and peak-aged NZ30K-Mg alloy have been tested and the results show that the testing samples isothermally aged at different temperature from 180 to 250 ℃ have almost the same peak yield strength of about 150 MPa, indicating that the strengthening effect of under-aged and peak-aged NZ30K-Mg alloy is only determined by the precipitation fraction within a certain range of temperatures. The precipitation strengthening model of NZ30K-Mg alloy has been carefully derived, and the parameter C in the model has then been determined by least squares method based on the tested yield strength data. The value of C is about 93 MPa. The prediction of yield strength of under-aged and peak-aged NZ30K-Mg alloy has been performed and fit well with the tested ones, demonstrating the effectiveness of precipitation strengthening model and its engineering application prospects.

Key words: NZ30K-Mg alloy precipitation kinetics precipitation strengthening solid solution strengthening yield strength

Received: 05 August 2013

ZTFLH:

TG166.3

Fund: Supported by National Science and Technology Major Project (Nos.2011ZX04014-052 and 2012ZX04012011)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00478 OR https://www.ams.org.cn/EN/Y2014/V50/I3/355

Fig.1

拉伸试样尺寸

Fig.2

NZ30K镁合金在不同加热速率连续升温过程中的电阻率ρ 和析出相的体积分数α_r

Fig.3

NZ30K镁合金的析出激活能与修正指前因子随析出相相对体积分数的变化

Fig.4

NZ30K镁合金不同温度等温时效的析出动力学曲线

Specimen No.	T / ℃	t / h	$α r$ / %	$σ y$ / MPa
1	180	1	0.111	109.71
2	180	2	0.174	111.43
3	180	5	0.269	122.25
4	180	10	0.332	125.68
5	180	20	0.397	131.29
6	180	50	0.513	133.39
7	180	100	0.684	141.19
8	180	200	0.897	148.88
9	200	1	0.197	127.43
10	200	2	0.282	135.24
11	200	5	0.397	138.00
12	200	10	0.504	144.44
13	200	20	0.697	148.50
14	200	50	0.941	151.53
15	250	0.25	0.304	138.28
16	250	0.5	0.548	148.89
17	250	0.75	0.717	149.60
18	250	1	0.850	152.59

Table 1 The relative precipitation volume fraction and yield strength of NZ30K-Mg alloy isothermally aged with different conditions ( σ_y —yield strength)

Fig.5

不同时效条件下NZ30K镁合金屈服强度的实验测试值和拟合值比较

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