NZ30K镁合金时效析出动力学与强化模型的研究<sup>*</sup>

doi:10.3724/SP.J.1037.2013.00478

金属学报

2014, Vol. 50

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

本期目录 | 过刊浏览

NZ30K镁合金时效析出动力学与强化模型的研究^*

王小娜¹, 韩利战^1,², 顾剑锋^1,²(

)

1 上海交通大学材料科学与工程学院, 上海 200240
2 上海市激光制造与材料改性重点实验室, 上海 200240

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

引用本文:

王小娜, 韩利战, 顾剑锋. NZ30K镁合金时效析出动力学与强化模型的研究^*[J]. 金属学报, 2014, 50(3): 355-360.
Xiaona WANG, Lizhan HAN, Jianfeng GU. PRECIPITATION KINETICS AND YIELD STRENGTH MODEL FOR NZ30K-Mg ALLOY[J]. Acta Metall Sin, 2014, 50(3): 355-360.

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摘要:

利用等转变量方法和恒速升温时效过程中的电阻实验研究了NZ30K镁合金的析出动力学, 获得了动力学模型的激活能 $E α r$ 和修正指前因子 $A' α r$ , 可用于准确描述不同时效条件下强化相的析出过程. NZ30K镁合金欠时效阶段和峰时效的力学性能显示, 在180~250 ℃范围内峰时效屈服强度一致, 约为150 MPa. 通过最小二乘法确定了NZ30K镁合金180~250 ℃范围内时效时析出强化模型参数C, 约为93 MPa, 实验数据和模型预测数据一致, 证明该模型能应用于NZ30K镁合金欠时效和峰时效条件下屈服强度的预测.

关键词 ： NZ30K镁合金, 析出动力学, 沉淀强化, 固溶强化, 屈服强度

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

收稿日期: 2013-08-05

ZTFLH:

TG166.3

基金资助:*国家科技重大专项资助项目 2011ZX04014-052和2012ZX04012011

作者简介: null

王小娜, 女, 1990年生, 硕士

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

图1

图2

图3

图4

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

表1 NZ30K镁合金等温时效处理后试样的相对析出体积分数和屈服强度

图5

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