衰老对Ni-丰富NiTi合金相变和机械行为的影响
Jerzy Ratajski1, Błażej Bałasz2, Katarzyna Mydłowska1
1Department of Biomedical Engineering, Faculty of Mechanical and Power Engineering, Koszalin University of Technology (KUT), ul. Śniadeckich 2, 75-453 Koszalin, Poland.
Materials (Basel, Switzerland)
|May 25, 2024
概括
本研究探讨了异热老化如何影响增材制造的- (NiTi) 合金中的相变. 老化改变了转变类型和温度,较长的老化时间缩小了马氏体到奥氏体的过渡范围.
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.
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- - (NiTi) 合金是重要的形状记忆材料.
- 增材制造 (SLM) 为NiTi提供了新的加工途径.
- 同热老化是一种后加工技术,可以改变合金的特性.
研究的目的:
- 调查异热老化对SLM生产的NiTi合金 (51.7at.%Ni) 阶段转换的影响.
- 描述转换序列,温度和物理性质的变化.
- 为了将衰老时间与观察到的微观结构和特性修改相关联.
主要方法:
- 差分扫描热量计 (DSC) 用于分析相变序列和温度.
- 用X射线衍射 (XRD) 来确定相位组成.
- 硬度和扬模量测量以评估机械性能.
主要成果:
- 在500°C进行同热老化1-100小时,将冷却转换从一阶段变为两阶段.
- 加热转化 (马氏体到奥氏体) 仍然是一步,但发生在更高的温度下,老化加快.
- 老化显著缩小了加热转换温度范围,硬度和扬模块等机械性能受到影响.
结论:
- 异热老化是一种有效的方法来调整增材制造的NiTi合金的相变行为.
- 长时间的老化过程导致马氏体-奥斯岩的转化在一致的温度范围内发生,无论合金成分或制造方法如何.
- 这些发现为优化NiTi合金性能在需要特定形状记忆特征的应用中提供了洞察力.
更多相关视频
14:51An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
Published on: September 23, 2018
6.9K
11:11Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
11.0K
相关概念视频
01:21Fatigue
181
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
181
01:24Stress-Strain Diagram - Ductile Materials
702
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...
702
01:12Temperature Dependent Deformation
147
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...
147
01:29Bone Disorders
3.5K
Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
3.5K