作为造Al-5Mg-3Zn-1Cu (wt%) 合金的热变形行为和处理图
Chuan Lei1, Qudong Wang1, Mahmoud Ebrahimi1
1National Engineering Research Center of Light Alloy Net Forming, State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel, Switzerland)
|June 10, 2023
概括
这项研究研究了Al-Mg-Zn-Cu合金的热变形,这对于汽车应用至关重要. 确定了一个可行的领域,证明了成本效益高的热成型工艺的足够可行性.
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:
- (Al) - (Mg) - (Zn) - 铜 (Cu) 合金对于汽车应用至关重要.
- 低成本成型是这些合金广泛采用的关键挑战.
研究的目的:
- 为了研究成Al-Mg-Zn-Cu合金的热变形行为.
- 建立加工地图并确定热成型的最佳条件.
- 了解变形过程中的动态软化机制.
主要方法:
- 同热单轴压缩试验在300-450°C的温度范围内进行,应变速率为0.001-10s-1.1.
- 一个应变补偿的Arrhenius型构成模型被用来描述流应力.
- 为了分析变形稳定性,生成了三维处理图.
主要成果:
- 合金表现出工作硬化,随后是动态软化.
- 不稳定性,主要是裂,发生在高张力率和低温度下.
- 在385-450°C和0.001-0.26s-1之间定义了一个可操作的域,其中动态恢复 (DRV) 和动态再结晶 (DRX) 主导.
- 随着温度的增加,主导的软化机制从DRV转向DRX.
- 在不同的条件下确定了特定的DRX机制 (CDRX,DDRX,PSN).
- 欧特克的T-Mg32(AlZnCu) 49阶段有助于DRX核化而不会造成不稳定.
结论:
- Al-Mg-Zn-Cu合金的热变形行为通过构成模型和处理图表得到了很好的描述.
- 一个特定的可操作域允许有效的热成型.
- 该合金具有足够的可加工性,可在汽车行业具有成本效益的制造.
相关概念视频
Temperature Dependent Deformation
174
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
174
Stress-Strain Diagram - Ductile Materials
873
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
873
Yield Criteria for Ductile Materials under Plane Stress
194
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
194
Steel Manufacturing
638
Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
638
Mechanical Characteristics of Steel
616
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
616
Residual Stresses
249
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
249


