MatWeb - Material Property Data 用 MatWeb 登广告!    Register Now
越过59,000 以上, 金属、塑料、陶瓷和合成物的数据资料库。
MatWeb - Material Property Data 主页  •  搜寻  •  工具  •  供应商  •  文件夹  •  有关我们  •  常用问题  •  登录   •  English English English 
  搜寻方法:  高级先进 | 材料类型 | 特性 | 构成份  | 商标  | 制造商
    Search

Vickers Hardness Testing

Microhardness testing of metals, ceramics, and composites is useful for a variety of applications for which 'macro' hardness measurements are unsuitable: testing very thin materials like foils, measuring individual microstructures, or measuring the hardness gradients of a part along the cross section. Microhardness testing per ASTM E-384 gives an allowable range of loads for testing with a diamond indenter; the resulting indentation is measured and converted to a hardness value. The actual indenters used are Vickers (more common; a square base diamond pyramid with an apical angle of 136) or Knoop (a narrow rhombus shaped indenter). The result for either Vickers or Knoop microhardness is reported in kg/cm2 and is proportional to the load divided by the square of the diagonal of the indentation measured from the test.

The figure below, courtesy of NewAge Instruments, shows the Vickers indenter geometry.

flexural strength testing apparatus Vickers Indentation
The figure at the left is a schematic diagram the square base diamond pyramid Vickers hardness indenter and sample indentation.

The load on the Vickers microhardness indenter usually ranges from a few grams to several kilograms. In contrast, 'Macro' Vickers loads vary from 1 to 120 kg. The indentations should be as large as possible to minimize errors in measuring the indentation (hence the reported hardness). Vickers hardness is also sometimes called Diamond Pyramid Hardness (DPH) owing to the shape of the indenter.

The test samples should have a smooth surface and be held perpendicular to the indenter. All things being equal, a lighter indenter load will require a smoother surface for a satisfactory test. Samples are usually mounted in plastic to fix them during preparation and testing.

Other hardness topics in MatWeb:

<meta http-equiv=Content-Type content="text/html; charset=UTF-8">
请读关于材料数据的使用许可协议和我们的隐私权。询问或评论有关 MatWeb? 请与webmaster@matweb.com 联系。我们感谢您对 MatWeb的参与。

本站点由 Automation Creations, Inc. 设计和维护。这个网站的内容, MatWeb 的商标,与 "MatWeb" 由 Automation Creations, Inc.版权1996-2006拥有 。 MatWeb 意欲为个人使用 , 非商业用途。这个站点的内容、结果和技术数据,未经由 Automation Creations, Inc. 允许, 不可以被电子,摄影或实质上地再生产或自动化创作。