在高度多孔的Ni-Fe-Ga泡中,弹性热量效应的可循环性很大
Muhammad Imran1,2, Mingfang Qian1, Xuexi Zhang1
1School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
研究人员开发了多孔的Ni-Fe-Ga泡,用于固态制冷. 这些材料表现出优异的弹性热效应 (eCE) 稳定性和可重复性,克服了铁磁形状记忆合金 (FSMA) 的脆性问题,用于实际应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热力学是一种热力学.
背景情况:
- 使用弹性热材料 (eCMs) 的固态制冷需要高的可逆性和可重复性来实现实际应用.
- 铁磁形状记忆合金 (FSMA) 显示出有前途的弹性热量效应 (eCE),但由于晶体间脆性,其疲劳寿命有限.
- 以前的研究表明,Ni-Fe-Ga FSMAs中eCE的周期性稳定性为53%.
研究的目的:
- 调查具有量身定制架构和较高孔隙度 (64%和73%) 的Ni-Fe-Ga泡的弹性热量效应 (eCE) 性能.
- 为了提高FSMA的周期稳定性和耐用性,用于先进的固态制冷应用.
主要方法:
- 制造具有受控单个和分层孔结构的Ni-Fe-Ga泡.
- 超弹性行为,压力歇斯底里和弹性热效应 (eCE) 在不同孔隙度下的表征.
- 在多个超弹性周期中评估弹性热效应 (eCE) 的周期稳定性.
主要成果:
- 在室温下在Ni-Fe-Ga泡 (64-73%的孔隙性) 中表现出完全可逆的超弹性行为,压力歇斯底里最小.
- 在45MPa的低应力下达到2.0K的最大可逆温度变化 (ΔT),在层次性孔泡中达到34的高性能系数 (COP) (64%的孔隙性).
- 在300多个循环中表现出稳定的弹性热量行为 (ΔT = 2.0 K),没有显著的降解.
结论:
- 定制材料架构,特别是引入孔层次结构,显著提高了Ni-Fe-Ga泡中的弹性热效应 (eCE) 循环性.
- 孔隙结构有效地减轻了谷物边界约束和裂传播,使FSMAs具有持久的疲劳寿命.
- 这项工作为设计强大的FSMA作为固态冷却技术的有效弹性热量材料 (eCM) 提出了一个可行的策略.
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