Mg96.17Zn3.15Y0.5Zr0.18合金高压下固溶处理时效硬化研究*

doi:10.11900/0412.1961.2016.00098

金属学报

2016, Vol. 52

Issue (12): 1491-1496 DOI: 10.11900/0412.1961.2016.00098

本期目录 | 过刊浏览

Mg_96.17Zn_3.15Y_0.5Zr_0.18合金高压下固溶处理时效硬化研究^*

樊志斌,林小娉(

),董允,叶杰,李婵,李博

东北大学材料科学与工程学院, 沈阳 110819

AGE-HARDENING RESPONSE FOR Mg_96.17Zn_3.15Y_0.5Zr_0.18 SOLID SOLUTION ALLOY UNDER HIGH PRESSURE

Zhibin FAN,Xiaoping LIN(

),Yun DONG,Jie YE,Chan LI,Bo LI

School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

樊志斌, 林小娉, 董允, 叶杰, 李婵, 李博. Mg_96.17Zn_3.15Y_0.5Zr_0.18合金高压下固溶处理时效硬化研究^*[J]. 金属学报, 2016, 52(12): 1491-1496.
Zhibin FAN, Xiaoping LIN, Yun DONG, Jie YE, Chan LI, Bo LI. AGE-HARDENING RESPONSE FOR Mg_96.17Zn_3.15Y_0.5Zr_0.18 SOLID SOLUTION ALLOY UNDER HIGH PRESSURE[J]. Acta Metall Sin, 2016, 52(12): 1491-1496.

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摘要:

在4 GPa 高压下对Mg_96.17Zn_3.15Y_0.5Zr_0.18合金进行600~800 ℃固溶处理, 之后在200 ℃进行等温时效处理. 利用TEM, HRTEM, SEM, XRD等分析方法研究了高压固溶及随后时效处理后合金的显微组织, 并测试了4 GPa高压下固溶处理后合金的时效硬化曲线. 结果表明, 在4 GPa高压下固溶能大幅提高 Zn 在Mg基体中的溶解度, Zn的溶解度由常压下400 ℃固溶后的2.11% (质量分数,下同) 提高到4 GPa高压下700~800 ℃固溶后的约6.60%, 获得了过饱和α-Mg 固溶体. 在随后的200 ℃温时效过程中, 高压固溶合金在较短的时间内即可获得较高的近峰值硬度, 4 GPa下800 ℃固溶的合金近峰值时效硬度高达105 HV, 比400 ℃固溶处理合金近峰时效硬度(81 HV)提高了约30%. HRTEM观察表明, 4 GPa高压下固溶合金时效沉淀析出相具有很高的析出密度, 且析出相中含有粒状准晶I-Mg₃Zn₆Y相.

关键词 ： Mg96.17Zn3.15Y0.5Zr0.18合金,, 高压固溶,, 溶解度,, 时效硬化,, 粒状准晶相

Abstract：

Rare-earth (RE) element addition can remarkably improve the mechanical properties of magnesium alloys through solid solution and age-hardening. Increasing the solubility in the Mg matrix and enhancing the precipitation density are effective measures to improve ageing strengthening of magnesium alloys. In this work, solid solution treatment at 600~800 ℃ under 4 GPa, and then isothermal ageing at 200 ℃ for Mg_96.17Zn_3.15Y_0.5Zr_0.18alloy was carried out. The microstructures of the high pressure solution treatment Mg_96.17Zn_3.15Y_0.5Zr_0.18alloy before and after ageing were investigated by TEM, HRTEM, SEM and XRD, and age-hardening curves of Mg_96.17Zn_3.15Y_0.5Zr_0.18 alloy after solution treatment under the high pressure of 4 GPa have been tested. The results show that, as the rise of the solution treatment temperature, I-Mg₃Zn₆Y and W-Mg₃Zn₃Y₂ continually dissolved into the Mg matrix, and the solubility of Zn in the Mg matrix drastically improved after solution treatment under the high pressure of 4 GPa. The solubility of Zn in the Mg matrix reached up to 6.60% (mass fraction) after solution treatment at 700~800 ℃ under the high pressure of 4 GPa than 2.11% after solution treatment at 400 ℃ under the atmosphere, and the supersaturated solid solution α-Mg has been attained. After ageing treatment at 200 ℃, the peak hardness of Mg_96.17Zn_3.15Y_0.5Zr_0.18 alloy after solution treatment under the high pressure of 4 GPa could been reached in short ageing time, the peak hardness of the Mg_96.17Zn_3.15Y_0.5Zr_0.18alloy after solution treatment at 800 ℃ under 4 GPa was 105 HV, which was increased by 30% than 81 HV of the alloy after solution treatment at 400 ℃ under the atmosphere. HRTEM analysis results indicated that the high precipitation density was found in the Mg_96.17Zn_3.15Y_0.5Zr_0.18alloy after solution treatment under the high pressure of 4 GPa, and some of precipitation were particle quasicrystal I-Mg₃Zn₆Y phases.

Key words： Mg96.17Zn3.15Y0.5Zr0.18 alloy, solution treatment under high pressure, solubility, age-hardening, granular quasicrystal phase

收稿日期: 2016-03-24

基金资助:* 国家自然科学基金项目51675092和51475486及河北省自然科学基金项目E2014501123资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00098 或 https://www.ams.org.cn/CN/Y2016/V52/I12/1491

图1 400 ℃固溶处理和4 GPa高压下不同温度固溶处理后Mg96.17Zn3.15Y0.5Zr0.18合金显微组织的SEM像

图2 400 ℃固溶处理和4 GPa高压下不同温度固溶处理后Mg96.17Zn3.15Y0.5Zr0.18合金的XRD谱

图3 4 GPa高压下800 ℃固溶Mg96.17Zn3.15Y0.5 Zr0.18合金晶界第二相形貌及EDS分析结果

图4 Zn元素在Mg基体中的分布

图5 400 ℃固溶和4 GPa高压下不同温度固溶Mg96.17Zn3.15Y0.5Zr0.18合金200 ℃等温时效硬化曲线

图6 400 ℃和4 GPa高压下800 ℃固溶Mg96.17Zn3.15Y0.5Zr0.18合金200 ℃等温时效达到近峰值硬度时显微组织的TEM像、HRTEM像及Fourier变换图

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