Characterization of friction stir welded boron carbide particulate reinforced AA6061 aluminum alloy stir cast composite

Influence of microstructural evolution on tensile properties of friction stir welded joint of rolled SiCp/AA2009-T351 sheet

3 mm thick rolled 17 vol%SiCp/AA2009 composite sheet in T351 condition (with 15% deformation) was subjected to friction stir welding (FSW) Tensile properties and work hardening behaviour of FSW joints were studied at strain rates from 1×10 −2 to 1×10 −5  s −1  The FSW joints tended to fracture in the heat-affected zone, which exhibited the lowest hardness Joint efficiencies of about 77% were achieved at various strain rates As the strain rates increased, the yield strength, ultimate tensile strength and elongation decreased slightly, but the effect of strain rate on the elongation became weaker after FSW The dependence of the strain-hardening exponents on the strain rate was weak in both the base metal (BM) and the FSW joint Compared to the BM, the FSW joint exhibited higher strain-hardening rates and strain-hardening exponents, as well as a stronger hardening capacity; about three times that of the BM

Tensile properties and strain-hardening behaviour of friction stir welded SiCp/AA2009 composite joints

Friction stir welding of SiCp/2009Al composite plate

Residual stresses and high cycle fatigue properties of friction stir welded SiCp/AA2009 composites

Using He–Ar mixed gas as shielding gas, the tungsten inert gas (TIG) welding of SiCp/6061 Al composites was investigated without and with Al–Si filler. Welded joint with filler were submitted to tensile tests. The microstructure and fracture morphology of the joint were examined. The results show that adding 50 vol.% helium in shielding gas improves the arc stability, and seams with high-quality appearance are obtained when the Al–Si filler is added. In addition, the interface reaction between SiC and matrix is greatly suppressed when using Al–Si filler. The microstructure of the welded joint displays non-uniformity with many SiC particles distributing in the weld center. The average tensile strength of weld joints with Al–Si filler is 70% above that of the matrix composites under annealed condition.

Wang Le-jun

Papers

Investigation on TIG welding of SiCp-reinforced aluminum–matrix composite using mixed shielding gas and Al–Si filler