| 烧结NdFeB永磁合金的断裂韧性 |
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| 引用本文： | 刘薇,曹力军,吴建生.烧结NdFeB永磁合金的断裂韧性[J].稀有金属材料与工程,2005,34(8):1239-1242. |
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| 作者姓名： | 刘薇 曹力军 吴建生 |
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| 作者单位： | 上海交通大学,高温材料与高温测试教育部重点实验室,上海,200030 |
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| 基金项目： | 国家自然科学基金资助项目（50071035）;上海自然科学基金资助项目（02ZE14054） |
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| 摘 要： | 用Zwick万能实验机测量了烧结NdFeB永磁合金样品的三点弯曲强度、断裂韧性KIC及弹性模量E。在三点弯曲试验中测得塑变功为0，而断裂功与最大消耗功相等，表明烧结NdFeB合金具有极大的缺口敏感性。缺口敏感的脆性材料用单边切口粱法（SENB）测量KIC时要求较高的抛光精度，以消除表面划痕的影响，比较而言，压痕法测量KIC简便迅速。但由于所用NdFeB合金为烧结复相材料，其微观结构的不均匀性使实验数据较为分散。本研究借助Palmqvist裂纹系统半椭圆裂纹模型HV-KIC的计算公式，采用开微缺口的单边缺口粱试样的KIC和压痕硬度及系列压痕裂纹参数，经回归分析确定了该公式中的经验常数，使之能够较为准确地表征烧结NdFeB永磁合金的断裂韧性。
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| 关 键 词： | 烧结NdFeB永磁合金 强度 断裂韧性 压痕法 |
| 文章编号： | 1002-185X(2005)08-1239-04 |
| 收稿时间： | 2003-08-20 |
| 修稿时间： | 2005-04-19 |
The Fracture Toughness of Sintered NdFeB Permanent Magnet |
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| Liu Wei;Cao LiJun;Wu JianSheng.The Fracture Toughness of Sintered NdFeB Permanent Magnet[J].Rare Metal Materials and Engineering,2005,34(8):1239-1242. |
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| Authors: | Liu Wei;Cao LiJun;Wu JianSheng |
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| Abstract: | The bending strength and fracture toughness of sintered NdFeB alloy are tested using a Zwick mechanical properties measure machine. The zero plastic energy in bending procedure shows the brittle characteristic of this kind of material. The Single-Edged-Notch-Bend (SENB) test for its fracture toughness also has the burden of polishing sample. So indentation microcracking is implemented as a simple evaluation method for the fracture toughness of sintered NdFeB alloy. In order to make the experiential parameters reliable in the relation of HV-KIC for Palmqvist crack system, HV and series indentation parameters such as P, a, l are measured to do the regression analysis of fracture toughness that is obtained by SENB test on a notched sample. |
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| Keywords: | sintered NdFeB alloy bending strength fracture toughness indentation method |
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