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金属学报  2018, Vol. 54 Issue (12): 1745-1755    DOI: 10.11900/0412.1961.2018.00174
  本期目录 | 过刊浏览 |
谢广明1(), 马宗义2, 薛鹏2, 骆宗安1, 王国栋1
1 东北大学轧制技术及连轧自动化国家重点实验室 沈阳 110819
2 中国科学院金属研究所 沈阳 110016
Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy
Guangming XIE1(), Zongyi MA2, Peng XUE2, Zongan LUO1, Guodong WANG1
1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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在800~1600 r/min工具转速和100 mm/min固定行进速度的较宽热输入范围内,对6 mm厚的热挤压态Mg-Zn-Y-Zr耐热镁合金板进行搅拌摩擦加工(FSP),获得了由均匀、细小的等轴再结晶晶粒和细小、弥散的Mg-Zn-Y三元W相构成的FSP样品。随着工具转速的增加,FSP样品中W相被显著细化且分布更加弥散,高角晶界(晶界错配角≥15°)比例明显增加,再结晶晶粒被细化。工具转速的增加使超塑性变形的最佳应变速率和延伸率均显著增加,1600 r/min工具转速的FSP样品在1×10-2 s-1的高应变速率和450 ℃的变形温度下,获得了1200%的最大延伸率。通过对超塑性变形数据进行分析和超塑性样品表面形貌观察可以得出,不同转速下所获得的FSP样品超塑性变形控制机制均以晶界滑移为主。随着工具转速的增加,超塑性动力学被明显加速,在1600 r/min工具转速的FSP样品的超塑性动力学与晶界滑移控制的细晶镁合金超塑性本构方程吻合。

关键词 搅拌摩擦加工镁合金超塑性晶界    

Compared to conventional Mg-Al and Mg-Zn system magnesium alloys, the Mg-Zn-Y-Zr heat-resistant alloy exhibits high thermal stability due to the addition of Y earth element, which is an ideal candidate for producing high strain rate superplasticity (HSRS, strain rate≥1×10-2 s-1). Recently, the HSRS of Mg-Zn-Y-Zr alloy was achieved by friction stir processing (FSP), because the FSP resulted in the generation of fine and equiaxed recrystallized grains and fine and homogeneous second phase particles. However, the study on superplastic deformation mechanism of FSP Mg-Zn-Y-Zr alloy at various parameters is limited relatively. Therefore, at the present work, six millimeters thick as-extruded Mg-Zn-Y-Zr plates were subjected to FSP at relatively wide heat input range of rotation rates of 800 r/min to 1600 r/min with a constant traverse speed of 100 mm/min, obtaining FSP samples consisting of homogeneous, fine and equiaxed dynamically recrystallized grains and fine and uniform Mg-Zn-Y ternary phase (W-phase) particles. With increasing rotation rate, within the FSP samples the W-phase particles were broken up and dispersed significantly and the recrystallized grains were refined slightly, while the fraction ratio of the high angle grain boundaries (grain boundaries misorientation angle≥15°) was increased obviously. Increasing rotation rate resulted in an increase in both optimum strain rate and superplastic elongation. For the FSP sample obtained at 1600 r/min, a maximum elongation of 1200% was achieved at a high-strain rate of 1×10-2 s-1 and 450 ℃. Grain boundary sliding was identified to be the primary deformation mechanism in the FSP samples at various rotation rates by superplastic data analyses and surfacial morphology observations. Furthermore, the increase in rotation rate accelerated superplastic deformation kinetics remarkably. For the FSP sample at 1600 r/min, superplastic deformation kinetics is in good agreement with the prediction by the superplastic constitutive equation for fine-grained magnesium alloys governed by grain boundary sliding mechanism.

Key wordsfriction stir processing    magnesium alloy    superplasticity    grain boundary
收稿日期: 2018-05-02     
ZTFLH:  TG456.9  

作者简介 谢广明,男,1980年生,副教授,博士


谢广明, 马宗义, 薛鹏, 骆宗安, 王国栋. 工具转速对搅拌摩擦加工Mg-Zn-Y-Zr耐热镁合金超塑性行为的影响[J]. 金属学报, 2018, 54(12): 1745-1755.
Guangming XIE, Zongyi MA, Peng XUE, Zongan LUO, Guodong WANG. Effects of Tool Rotation Rates on Superplastic Deformation Behavior of Friction Stir Processed Mg-Zn-Y-Zr Alloy. Acta Metall Sin, 2018, 54(12): 1745-1755.

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图1  Mg-Zn-Y-Zr合金母材和不同工具转速下搅拌摩擦加工(FSP)样品的OM像
图2  Mg-Zn-Y-Zr合金母材与不同转速下FSP样品的SEM像
图3  Mg-Zn-Y-Zr合金母材和转速为1600 r/min的FSP样品中Mg、Zn、Y元素的EPMA面分布
图4  Mg-Zn-Y-Zr合金母材和转速为1600 r/min的FSP样品的XRD谱
图5  Mg-Zn-Y-Zr母材和不同转速下FSP样品的EBSD取向图
图6  Mg-Zn-Y-Zr母材和不同转速下FSP样品的晶界错配角分布图
图7  不同转速FSP样品在不同变形温度下的初始应变速率与延伸率之间的关系
图8  不同转速FSP样品在不同温度下初始应变速率与流变应力的关系
图9  不同转速下FSP样品超塑性测试的拉断样品形貌
图10  不同转速下FSP样品在超塑性变形后的表面SEM像
图11  ε˙kTd3D0-1G-1b-4与σG-1之间的关系
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