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| B4CP/2009Al复合材料动态再结晶临界条件 |
| Critical Conditions of Dynamic Recrystallization for B4CP/2009Al Composite |
| Received:December 14, 2017 Revised:March 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.02.012 |
| 中文关键词: B4CP/2009Al复合材料 动态再结晶 临界条件 加工硬化率 |
| 英文关键词: B4CP/2009Al composite dynamic recrystallization critical conditions strain hardening rate |
| 基金项目:国家自然科学基金（52105028） |
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| 中文摘要: |
| 目的 研究B4CP/2009Al复合材料的热变形流变行为，确定B4CP/2009Al复合材料发生动态再结晶的临界条件。方法 采用Gleeble-1500热模拟机对体积分数为25%的B4CP/2009Al复合材料进行热压缩试验，热压缩温度为300~500 ℃，应变速率为0.001~1 s−1，并建立热变形本构方程。基于加工硬化率曲线(θ-σ)，获得动态再结晶临界条件。结果 B4CP/2009Al复合材料的流变应力随温度的升高和应变速率的降低而降低。临界应力(σc)与峰值应力(σp)存在线性关系：σc=0.2992σp+22.4698，引入Zener-Hollomon参数描述变形条件对临界条件的影响，得到临界应变与Z参数的关系：εc=1.35×10−3Z0.047 39。结论 B4CP/2009Al复合材料的流变应力曲线以动态再结晶软化机制为主要特征，B4C增强颗粒的加入促进了复合材料的动态再结晶。 |
| 英文摘要: |
| The paper aims to study hot deformation behaviors of B4CP/2009Al composite and confirm the critical conditions of its dynamic recrystallization. The hot compression tests of 25% B4CP/2009Al composite were conducted at deformation tem- perature of 300~500 ℃ and strain rate of 0.001~1 s−1 on a Gleeble-1500 thermal simulator. The hot deformation constitutive equation was established. Based on the strain hardening rate curves (θ-σ), the critical conditions of dynamic recrystallization were identified. The flow stress-strain of B4CP/2009Al composite decreased with the increase of temperature and the decrease of strain rate. There was a liner relationship between σc and σp: σc=0.2992σp+22.4698, and the Zener-Hollomon parameter was in- troduced to describe the effect of deformation conditions on critical conditions: εc=1.35×10−3Z0.047 39. The flow stress-strain curve of B4CP/2009Al composite shows the main characteristic of dynamic recrystallization and the addition of B4C particles promotes the dynamic recrystallization process of the composite. |
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