一种类似聚合物的超高强度金属合金
Zhizhi Xu1, Yuanchao Ji2, Chang Liu1,3
1Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an, China.
Nature
|September 4, 2024
概括
研究人员开发了一种新的-压力玻璃合金. 这种强而又灵活的材料具有极高的强度和类似聚合物的弹性,
科学领域:
- 材料科学
- 金属工程
- 机械工程
背景情况:
- 开发具有高强度和灵活性的金属合金对于变形飞机和人工肌肉等先进技术至关重要.
- 传统合金中固有的强度和灵活性之间的权衡在历史上限制了它们在苛刻的未来设计中的应用.
- 实现超高强度和低弹性模块的组合,类似于聚合物,仍然是一个重要的材料科学挑战.
研究的目的:
- 设计一种超越强度-灵活性权衡的新型金属合金,
- 调查微观结构的起源和变形机制负责开发合金的独特机械特性.
- 评估合金在不同温度范围内的性能及其适用于可扩展的工业生产.
主要方法:
- 使用可扩展的三阶段热力学处理制造Ti-50.8%的Ni压力玻璃合金.
- 机械性质的表征,包括度强度,弹性模量和弹性应变,在广泛的温度范围内 (-80°C至+80°C).
- 在现场进行X射线衍射测量,分析装载和卸载过程中的可逆相变,阐明变形机制.
主要成果:
- Ti-Ni应变玻璃合金具有超高的强度 (≈1.8 GPa) 和超低的弹性模量 (≈10.5 GPa),实现了高灵活性值 (≈0.17).
- 合金具有很大的状弹性 (约8%) 并在广泛的温度范围内保持其卓越的耐疲劳性能.
- 一个独特的"双种压力玻璃"微结构,包括一个压力玻璃矩阵与嵌入的R和B19"马氏体种子,被确定为其特性的关键.
结论:
- 开发的Ti-Ni压力玻璃合金成功地解决了强度-灵活性悖论,提供了前所未有的机械性能.
- 观察到的聚合物样变形行为归因于应变玻璃和马氏体相之间的无核可逆过渡.
- 这种易于生产的外来合金具有发展未来技术的巨大潜力, 包括航空航天,机器人和生物医学设备.
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