Deformation-induced nanocrystallization and its influence on work hardening in a bulk amorphous matrix composite
Deformation-induced nanocrystallization and its influence on work hardening in a bulk amorphous matrix composite
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DOI：
10.1016/j.actamat.2003.11.034
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发表时间：
2004-04
期刊：
影响因子：
9.4
通讯作者：
Jae-Chul Lee;Yu-Chan Kim;Jae-pyoung Ahn;Hyoung-Seop Kim;Sunghak Lee;Byeong-Joo Lee
中科院分区：
文献类型：
--
作者：
Jae-Chul Lee;Yu-Chan Kim;Jae-pyoung Ahn;Hyoung-Seop Kim;Sunghak Lee;Byeong-Joo Lee
随着生产具有增强塑性的大块非晶复合材料的各种工艺的发展，对非晶合金在塑性状态下的机械行为的研究现已变得可行。除了显着增强的塑性外，一些大块非晶复合材料在塑性变形过程中还表现出加工硬化行为。考虑到在晶体金属中起作用的大多数强化机制，例如固溶硬化、马氏体硬化等，都与位错相关，因此从不存在位错的非晶复合材料中观察到的加工硬化行为具有特殊的科学意义。我们观察到，对非晶态复合材料施加的准静态压缩会导致纳米微晶从复合材料的非晶态基体中均匀沉淀，从而增强非晶态复合材料的强度。还研究了非晶基复合材料的强化机制。
With the development of various processes to produce bulk amorphous composites with enhanced plasticity, investigations of the mechanical behaviors of the amorphous alloys in the plastic regime have now become feasible. In addition to dramatically enhanced plasticity, some bulk amorphous composites have exhibited a work hardening behavior during plastic deformation. Considering that most strengthening mechanisms, such as solid solution hardening, martensitic hardening, etc., operative in crystalline metals are associated with dislocations, the work hardening behavior observed from amorphous composites, where dislocations do not exist, is of a special scientific interest. We have observed that quasistatic compression imposed to the amorphous composite induces the homogeneous precipitation of nanocrystallites from the amorphous matrix of the composite, which, in turn, leads to strengthening the amorphous composite. The strengthening mechanism of the amorphous matrix composite is investigated as well.