Advanced Materials & Processes 

About: Advanced Materials & Processes is an academic journal. The journal publishes majorly in the area(s): Corrosion & Ceramic. It has an ISSN identifier of 0882-7958. Over the lifetime, 807 publications have been published receiving 7099 citations.

Microindentation Hardness Testing

Abstract: IN MICROINDENTATION HARDNESS TESTING (MHT), a diamond indenter of specific geometry is impressed into the surface of the test specimen using a known applied force (commonly called a “load” or “test load”) of 1 to 1000 gf. Historically, the term “microhardness” has been used to describe such tests. This term, taken at face value, suggests that measurements of very low hardness values are being made, rather than measurements of very small indents. Although the term “microhardness” is well established and is generally interpreted properly by test users, it is best to use the more correct term, microindentation hardness testing. There is some disagreement over the applied force range for MHT. ASTM E 384 states that the range is 1 to 1000 gf, and this is the commonly accepted range in the United States. Europeans tend to call the range of 200 to 3000 gf the “low-load” range. They do this because forces smaller than 200 gf generally produce hardness numbers that are different from those determined from tests conducted with forces ≥200 gf. This problem is discussed later in this article. The hardness number is based on measurements made of the indent formed in the surface of the test specimen. It is assumed that recovery does not occur upon removal of the test force and indenter, but this is rarely the case. The Knoop test is claimed to eliminate recovery, but again, this is not true for tests of metallic materials. For the Vickers test, both diagonals are measured and the average value is used to compute the Vickers hardness (HV). The hardness number is actually based on the surface area of the indent itself divided by the applied force, giving hardness units of kgf/mm2. In the Knoop test, only the long diagonal is measured, and the Knoop hardness (HK) is calculated based on the projected area of the indent divided by the applied force, also giving test units of kgf/mm2. In practice, the test units kgf/mm2 (or gf/μm2) are not reported with the hardness value.

Joining advanced materials

Abstract: Introduction to joining mechanical fastening mechanical fasteners and joining methods adhesive bonding process welding as a process the metallurgy of welding brazing soldering other joining processes joining of metals alloys and intermetallics joining of ceramics and of glasses joining of polymers joining composite materials joining dissimilar material combinations.