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  2. Metallography - Wikipedia

    en.wikipedia.org/wiki/Metallography

    Polarized light (PL) is very useful when studying the structure of metals with non-cubic crystal structures (mainly metals with hexagonal close-packed (hcp) crystal structures). If the specimen is prepared with minimal damage to the surface, the structure can be seen vividly in cross-polarized light (the optic axis of the polarizer and analyzer ...

  3. Non-ferrous metal - Wikipedia

    en.wikipedia.org/wiki/Non-ferrous_metal

    In metallurgy, non-ferrous metals are metals or alloys that do not contain iron (allotropes of iron, ferrite, and so on) in appreciable amounts.. Generally more costly than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g. aluminium), higher conductivity (e.g. copper), [1] non-magnetic properties or resistance to corrosion (e.g. zinc). [2]

  4. Interactive Mathematics Program - Wikipedia

    en.wikipedia.org/.../Interactive_Mathematics_Program

    The Interactive Mathematics Program (IMP) is a four-year, problem-based mathematics curriculum for high schools. It was one of several curricula funded by the National Science Foundation and designed around the 1989 National Council of Teachers of Mathematics (NCTM) standards .

  5. Heavy metals - Wikipedia

    en.wikipedia.org/wiki/Heavy_metals

    Heavy metals is a controversial and ambiguous term [2] for metallic elements with relatively high densities, atomic weights, or atomic numbers.The criteria used, and whether metalloids are included, vary depending on the author and context and has been argued should not be used.

  6. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    Spark testing of tool steel Spark testing of mild steel. Spark testing is a method of determining the general classification of ferrous materials. It normally entails taking a piece of metal, usually scrap, and applying it to a grinding wheel in order to observe the sparks emitted. [1]

  7. Galling - Wikipedia

    en.wikipedia.org/wiki/Galling

    Galling is a common problem in most applications where metals slide in contact with other metals. This can happen regardless of whether the metals are the same or different. Alloys such as brass and bronze are often chosen for bearings , bushings , and other sliding applications because of their resistance to galling, as well as other forms of ...

  8. NYT ‘Connections’ Hints and Answers Today, Sunday, December 15

    www.aol.com/nyt-connections-hints-answers-today...

    Today's NYT Connections puzzle for Sunday, December 15, 2024The New York Times

  9. Hardness - Wikipedia

    en.wikipedia.org/wiki/Hardness

    When testing coatings, scratch hardness refers to the force necessary to cut through the film to the substrate. The most common test is Mohs scale, which is used in mineralogy. One tool to make this measurement is the sclerometer. Another tool used to make these tests is the pocket hardness tester. This tool consists of a scale arm with ...