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A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
Mohs hardness [1] Vickers hardness ... aluminium: 2.75: 160–350: 160–550: 184 14: Si: ... Vickers hardness test; Brinell scale This page was last ...
The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1] There are different scales, denoted by a single letter, that use different loads or indenters.
The hardness may also be shown as XXX HB YYD 2. The XXX is the force to apply (in kgf) on a material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels). Thus a typical steel hardness could be written: 250 HB 30D 2. It could be a maximum or a minimum.
The retrogression and reage (RRA) temper is a multistage heat treatment temper. Starting with a sheet in the T6 temper, it involves overaging past peak hardness (T6 temper) to near the T7 temper. A subsequent reaging at 120 °C for 24 hours returns the hardness and strength to or very nearly to T6 temper levels. [10]
6061 aluminium alloy (Unified Numbering System (UNS) designation A96061) is a precipitation-hardened aluminium alloy, containing magnesium and silicon as its major alloying elements. Originally called "Alloy 61S", it was developed in 1935. [ 2 ]
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Brinell hardness Bending change resistance/MPa EN AW-6005 AlSiMg T5 69500 26500 255 280 11 85 n.b. EN AW-6005A AlSiMg(A) T1 69500 26200 100 200 25 52 n.b. T4 69500 26200 110 210 16 60 n.b. T5 69500 26200 240 270 13 80 n.b. T6 69500 26200 260 285 12 90 n.b. EN AW-6008 AlSiMgV T6 69500 26200 255 285 14 90 n.b. EN AW-6056 AlSi1MgCuMn T78 69000 25900
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