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半固体造AZ91D合金的热变形特性和动态再结晶机制
Zehua Yan1, Guozheng Zhang1, Sheng Yang1
1Rongcheng College, Harbin University of Science and Technology, Weihai 264300, China.
Materials (Basel, Switzerland)
|August 29, 2024
概括
这项研究研究了半固体造AZ91D合金的高温变形,重点是动态再结晶 (DRX). 结果显示DRX影响产应力,模型预测了改进合金应用的机械行为.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 机械工程 机械工程
背景情况:
- 合金为先进的运输和航空航天应用提供了潜力.
- 由于塑性差和强度限制,广泛采用受到了阻碍.
- 了解高温变形对于优化合金性能至关重要.
研究的目的:
- 为了研究半固体造AZ91D合金的高温变形.
- 了解变形条件对动态再结晶 (DRX) 的影响.
- 开发DRX和机械行为的预测模型.
主要方法:
- 实验测试和数值模拟的组合.
- 对产量应力曲线和微观结构变化的分析.
- 制定关键应变和DRX体积分数模型.
主要成果:
- 动态再结晶 (DRX) 迹象随着应变的增加而出现.
- 降低拉伸速率和降低温度降低了产应力和峰值拉伸.
- 激活能量确定为156.814 kJ/mol;临界和峰值应变保持一致.
- 经过验证的模型准确地预测了机械行为和微观结构的演变.
结论:
- 这项研究为预测AZ91D合金的变形行为提供了基础.
- 开发的模型有助于选择塑料变形参数和设计模具结构.
- 数字模拟模型准确地反映了应力,应变和速度分布.
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