Mg96.17Zn3.15Y0.5Zr0.18合金高压下固溶处理时效硬化研究
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-06-24
在4 GPa 高压下对Mg96.17Zn3.15Y0.5Zr0.18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.
Mg96.17Zn3.15Y0.5Zr0.18合金高压下固溶处理时效硬化研究AGE-HARDENING RESPONSE FOR Mg96.17Zn3.15Y0.5Zr0.18 SOLID
SOLUTION ALLOY UNDER HIGH PRESSURE 在4 GPa 高压下对Mg96.17Zn3.15Y0.5Zr0.18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.
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 aging strengthening of magnesium alloys. In this work, solid solution treatment at 600~800 ℃ under 4 GPa, and then isothermal aging at 200 ℃ for
Mg96.17Zn3.15Y0.5Zr0.18 alloy was carried out. The microstructures of the high pressure solution treatment
Mg96.17Zn3.15Y0.5Zr0.18 alloy before and after aging were investigated by TEM, HRTEM, SEM and XRD, and
age-hardening curves of Mg96.17Zn3.15Y0.5Zr0.18 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 aging treatment at 200 ℃, the peak hardness of Mg96.17Zn3.15Y0.5Zr0.18 alloy after solution treatment
under the high pressure of 4 GPa could been reached in short aging time, the peak hardness of the Mg96.17Zn3.15Y0.5Zr0.18 alloy 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 Mg96.17Zn3.15Y0.5Zr0.18 alloy after solution treatment
under the high pressure of 4 GPa, and some of precipitation were particle quasicrystal I-Mg3Zn6Y phases.
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