Aluminum tensile properties

Figure 1 5.5 Reinforced plastics, steel, and aluminum tensile properties compared (courtesy of Plastics FALLO)...

Some nominal chemical composition of aluminum cast alloys and their tensile properties are listed in Table 4.22 and 4.23, respectively. 

Table 4.20 Typical tensile properties of representative non-heat-treatable aluminum wrought alloys in various tempersa,b...

Table 4.23 Typical tensile properties of representative aluminum casting alloys in various tempers3...

Selected postweld transverse tensile properties for a variety of Ixxx aluminum alloys are shown in Table 5.5. Natural aging times were not reported. Although not always identihed, the failure location is most often in the soft HAZ. Transverse weld failures correspond directly with hardness minima where failure location is shown to move further into the HAZ... 

Table 5.5 Transverse tensile properties of friction stir welded 1 aluminum alloys...

Y. Sato and H. Kokawa, Distribution of Tensile Property and Microstructure in Friction Stir Weld of 6063 Aluminum, Metall. Mater. Trans. A, Vol 32, Dec 2001, P 3023-3031... 

Hardness and Tensile Properties. Recall that an increased hardness was observed in the HAZ. This trend was opposite to that found in precipitation-hardened and/or cold-worked aluminum alloys, which exhibit a large drop in hardness in the HAZ due to overaging or recrystallization, respectively. The exact reason for the increase in HAZ hardness here is not known however, it may have resulted from cold working of the HAZ during FSW and/or from straining during cooling due to coefficient of thermal expansion differences between the a and 3... 

The tensile properties in the HAZ are equivalent to or lower than those of the as-received parent material, and the tensile and yield strengths decrease with increasing distance from the FSP zone boundaries (Fig. 14.37). In the HAZ, as expected, FSP did not break up the coarse silicon particles and aluminum dendrites, and conversely led to a coarsening of precipitates. In the HAZ, FSP did not result in an improvement in mechanical properties but actually resulted in a decrease. Control of microstructure in the HAZ during FSP will be critical for achieving mechanical properties equivalent to or better than the starting material. 

Z.Y. Ma, S.R. Sharma, and R.S. Mishra, Effect of Multiple-Pass Friction Stir Processing on Microstructure and Tensile Properties of a Cast Aluminum-Silicon Alloy, Scr. Mater., Vol 54 (No. 9), May 2006, p 1623-1626... 

Figure 7.4 Past to future tensile properties of RPs, steel, and aluminum...

Table I. Tensile Properties of Aluminum AUoys at Low Temperatures ...

Specified minimum tensile properties from Aluminum Standards and Data, Aluminum Association, 1976. Tensile Strength = 276MPa (40k i) Yield Strength = 124 MPa (18 ksi) Elongation in 4D = 18% ( ]. t Offset = 0.2% gauge length 50.8 mm (2 in.). 

As described by DuPont researchers, significant weight saving and low flammability are the primary driving forces behind the adoption of Kevlar by the aircraft industry. Kevlar-epoxy composites are 25-50% lighter than those from glass and aluminum and have better tensile properties. Because thermotropic LCPs offer a low viscosity for the impregnation of carbon fibers and excellent chemical resistance, LCP-carbon fiber composite has been developed as a secondary composite for the aerospace industry [6]. 

Sodium aluminum silicate has been found to be an effective extender of colorants, replacing up to 10 percent of Ti02 in a variety of compounds. The grades with higher structure also produce higher levels of reinforcement. In a polyvinyl chloride plastisol, for example, replacing 10 percent Ti02 increases tensile properties by about 25 percent. 

Many investigations have been made on the low-temperature properties of aluminum alloys [1-4] however, in addition to the determination of tensile and elastic properties as a function of temperature, notched tensile properties and notched/unnotched tensile ratios were determined. The notched/unnotched ratios were determined as a function of temperature in order to evaluate the toughness, which is often referred to in terms of resistance to brittle fracture, or notch sensitivity [5-7]. A notched specimen with a stress concentration factor K oi 6.3 was selected for use in this investigation because previous axial fatigue tests of complex welded joints, and fatigue and burst tests of pressure vessels made of 301 extra full hard stainless steel exhibited excellent correlation with notched/unnotched tensile ratios obtained with this value of over a range of temperatures... 

The tensile properties of the 7000 series aluminum alloys were determined as a function of temperature from 78° to 423°F. Partial embrittlement, as determined by notch/unnotched tensile ratios, was experienced by all the alloys at cryogenic temperatures however, 7079-T6 sheet material was found to retain sufficient toughness for structural applications to-320 F. The low temperature... 

The interest in the use of aluminum alloys for cryogenic applications has stemmed from the long-recognized increases in tensile properties of these alloys at depressed temperatures [1 4], The fact that the elongations, as well as the strengths, of most aluminum alloys increase as temperature decreases, and that the reduction of area values are about the same at 320 F as at room temperature, formed the basis for further study of the properties of these alloys at low temperature. Also of importance was the often demonstrated absence of transition in fracture behavior. 

---