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太原理工大学等 | Acta | 位错从哪里开始?L12 相干界面如何主导(CoCrNi)94Al3Ti3中熵合金的起始塑性

  • 2026-02-04 19:25:36
太原理工大学等 | Acta | 位错从哪里开始?L12 相干界面如何主导(CoCrNi)94Al3Ti3中熵合金的起始塑性
文章题目：L12沉淀 (CoCrNi)94Al3Ti3 中熵合金初生塑性临界强度的多峰性：共格界面促进位错成核
第一作者：Qian Zhang
通讯作者：Junwei Qiao & Yakai Zhao
通讯单位：太原理工大学 & 新加坡科学技术研究局
上线日期：2025-2-13

文章速读：本文通过纳米压痕系统研究了L12 析出相尺寸演化对 (CoCrNi)94Al3Ti3 中熵合金起始塑性行为的影响，首次揭示了相干界面可显著降低位错形核临界应力，并导致起始屈服强度呈现多模态分布的本质机制

合金成分：(CoCrNi)94Al3Ti3，at%
合金类型：中熵合金
研究方向：起始塑性｜位错形核机制
性能测试：纳米压痕
加工参数：合金首先采用高纯元素（≥99.9 wt.%）在高纯氩气保护下电弧熔炼制备铸锭，并通过多次翻转重熔以保证成分均匀，随后滴铸成板材；铸态合金在950 °C 进行热轧，压下率约75%，去除氧化皮后在充氩石英管中于 1200 °C 均匀化处理 24 h 并水淬；均匀化后的样品在 950 °C 进行不同时长时效处理（1–6000 min）以获得不同尺寸的 L12 析出相；最终样品经机械抛光与电解抛光去除加工硬化层后，进行纳米压痕测试以表征起始塑性行为
一段话：该研究以L12 析出强化的 (CoCrNi)94Al3Ti3中熵合金为模型体系，利用纳米压痕系统揭示了起始塑性行为的随机性与多机制并存特征。随着时效过程中L12 析出相尺寸由纳米级逐步粗化，材料的起始屈服强度 τᵧ 并非单调变化，而是先降低后升高，在 60 min 时效条件下达到最小值。统计分析表明，不同时效状态下 τᵧ 分布呈现双峰或三峰特征，反映了单空位诱导异质位错形核、相干界面辅助位错形核以及均匀位错形核等多种机制的协同作用。研究进一步证明，相干L12/基体界面能够显著降低位错形核所需临界应力，成为一种“特殊位错源”，为通过界面工程实现强度–塑性协同优化提供了新的物理图像和设计思路

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文章链接：https://doi.org/10.1016/j.actamat.2025.120826
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  1. CONNECT:[ UseTime:0.000664s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000748s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008827s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.003891s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000572s ]
  8. SELECT * FROM `article` WHERE `id` = 465345 LIMIT 1 [ RunTime:0.003714s ]
  9. UPDATE `article` SET `lasttime` = 1771918371 WHERE `id` = 465345 [ RunTime:0.019566s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.006681s ]
  11. SELECT * FROM `article` WHERE `id` < 465345 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002856s ]
  12. SELECT * FROM `article` WHERE `id` > 465345 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002575s ]
  13. SELECT * FROM `article` WHERE `id` < 465345 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007629s ]
  14. SELECT * FROM `article` WHERE `id` < 465345 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005812s ]
  15. SELECT * FROM `article` WHERE `id` < 465345 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.023918s ]
0.158068s