The non-uniform distribution of mechanical properties in low-pressure die casting (LPDC) parts complicates property evaluation and application. In this study, the LPDC Al-10Si-0.3Mg alloy subframe was investigated. Tensile results showed significant non-uniformity in elongation and tensile strength across regions, while yield strength exhibited minimal variation. Computerized tomography (CT), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) were combined to analyse the cause of mechanical properties variations. Fracture surface analysis and quantitative statistics revealed that shrinkage porosities and oxide inclusions determined the fracture location of tensile specimens. A larger area fraction of shrinkage porosities and oxide inclusions resulted in lower elongation. A model was subsequently proposed to predict elongation and tensile strength of the LPDC part. This model was combined with the Pro-CAST simulation results to predict distributions of elongation and tensile strength in LPDC castings. A comparison with experimental data showed good agreement between the predicted and observed results.
BarbosaJPugaH. Ultrasonic melt processing in the low pressure investment casting of Al alloys. J Mater Process Technol2017; 244: 150–156.
2.
XuQZhuYQiS, et al.Safety assessment of sand casting explosion accidents by testing cavity pressure of the sand mold to protect employee health. Heliyon2024; 10: e25736.
3.
LuoAASachdevAKApelianD. Alloy development and process innovations for light metals casting. J Mater Process Technol2022; 306: 117606.
4.
LuoAA. Advanced metal casting. In: CaballeroFG (eds) Encyclopedia of materials: metals and alloys. Oxford: Elsevier, 2022, pp.13–26.
5.
Yu-Tong YangZ-YQZhengZPuL-X, et al.Al-enabled properties distribution prediction for high-pressure die casting Al-Si alloy. Adv Manuf2024; 12: 591–602.
6.
DongGLiSMaS, et al.Process optimization of A356 aluminum alloy wheel hub fabricated by low-pressure die casting with simulation and experimental coupling methods. J Mater Res Technol2023; 24: 3118–3132.
7.
HanJDongGLiS, et al.Uneven distribution of cooling rate, microstructure and mechanical properties for A356-T6 wheels fabricated by low pressure die casting. J Manuf Processes2024; 127: 196–210.
8.
LeeS-IKayaniSHLeeY-H, et al.The effect of melt thermal-rate treatment on precipitation hardening and mechanical properties of Al–Si–Mg alloys. J Mater Res Technol2024; 33: 2704–2717.
9.
TimelliGCaliariDRakhmonovJ. Influence of process parameters and Sr addition on the microstructure and casting defects of LPDC A356 alloy for engine blocks. J Mater Sci Technol2016; 32: 515–523.
10.
SunJLeQFuL, et al.Gas entrainment behavior of aluminum alloy engine crankcases during the low-pressure-die-casting process. J Mater Process Technol2019; 266: 274–282.
11.
ZhaoHDWangFLiYY,et al.Experimental and numerical analysis of gas entrapment defects in plate ADC12 die castings. J Mater Process Technol2009; 209: 4537–4542.
12.
LiuS-GCaoF-YZhaoX-Y, et al.Characteristics of mold filling and entrainment of oxide film in low pressure casting of A356 alloy. Mater Sci Eng, A2015; 626: 159–164.
13.
DhisaleMVasavadaJTewariA. An approach to optimize cooling channel parameters of Low pressure Die casting process for reducing shrinkage porosity in Aluminium alloy wheels. Mater Today Proc2022; 62: 3189–3196.
14.
KırmızıgölSFÖzaydinOAcarerS. Improving heat transfer and compressed air consumption in low pressure die casting of aluminum wheels. Appl Therm Eng2024; 251: 123598.
15.
CaoLSunFChenT, et al.Quantitative prediction of oxide inclusion defects inside the casting and on the walls during cast-filling processes. Int J Heat Mass Transfer2018; 119: 614–623.
16.
NicolettoGKonečnáRFintovaS. Characterization of microshrinkage casting defects of Al–Si alloys by X-ray computed tomography and metallography. Int J Fatigue2012; 41: 39–46.
17.
LiQQiuFDongB-X, et al.Investigation of the influences of ternary Mg addition on the solidification microstructure and mechanical properties of as-cast Al–10Si alloys. Mater Sci Eng, A2020; 798: 140247.
18.
KayaniSHLeeS-UEuhK, et al.Effect of as-cast microstructure on precipitation behavior and thermal conductivity of T5-treated Al7Si0.35Mg alloy. J Alloys Compd2024; 976: 173004.
19.
YangYZhengJHuangS, et al.The role of strain rate in microstructure evolution, deformation heterogeneity and cracking mode of high-pressure die-casting Al7Si0.2Mg alloy. Mater Sci Eng, A2023; 888: 145798.
20.
YangY-tHuangS-yZhengJ, et al.Effect of porosity and α-Al(Fe/Mn)Si phase on ductility of high-pressure die-casting Al−7Si−0.2Mg alloy. Trans Nonferrous Met Soc China2024; 34: 378–391.
21.
ZhangYShenFZhengJ, et al.Ductility prediction of HPDC aluminum alloy using a probabilistic ductile fracture model. Theor Appl Fract Mech2022; 119: 103381.
22.
ZhangYLordanEDouK, et al.Influence of porosity characteristics on the variability in mechanical properties of high pressure die casting (HPDC) AlSi7MgMn alloys. J Manuf Processes2020; 56: 500–509.
23.
YangB-CChenS-FSongH-W, et al.Effects of microstructure coarsening and casting pores on the tensile and fatigue properties of cast A356-T6 aluminum alloy: a comparative investigation. Mater Sci Eng, A2022; 857: 144106.
24.
ZiaeiHFanGTanZ, et al.Sio2 coating on CNTs to fabricate the Al4O4C-Al composite with superior Young's modulus. Mater Charact2024; 207: 113597.
25.
RatchfordJBCrawfordBAWolfenstineJ, et al.Young's modulus of polycrystalline Li12Si7 using nanoindentation testing. J Power Sources2012; 211: –3.
26.
DashSSLiDJZengXQ, et al.On the origin of deformation mechanisms in a heterostructured aluminum alloy via slip trace and lattice rotation analyses. Mater Sci Eng, A2023; 867: 144723.
27.
YePJiangFWuF, et al.Effects of Zr and Y additions on microstructure and mechanical properties of cast A356 alloy. J Mater Res Technol2024; 30: 6355–6365.
28.
JiYWangMQinW, et al.Near-atomic-scale study of the oxide films on the grain boundaries of Al-Mg alloys at the initial stage of corrosion: experimental investigations and DFT calculations. Corros Sci2025; 244: 112640.
29.
LiuRZhengJGodlewskiL, et al.Influence of pore characteristics and eutectic particles on the tensile properties of Al–Si–Mn–Mg high pressure die casting alloy. Mater Sci Eng, A2020; 783: 139280. https://doi.org/10.1016/j.msea.2020.139280
30.
JiaoXLiuCWangJ, et al.On the characterization of microstructure and fracture in a high-pressure die-casting Al-10 wt%Si alloy. Prog Nat Sci Mater Int2020; 30: 221–228.
31.
LordanELazaro-NebredaJZhangY, et al.On the relationship between internal porosity and the tensile ductility of aluminium alloy die-castings. Mater Sci Eng, A2020; 778: 139107.
32.
ZhangYZhengJShenF, et al.Ductile fracture prediction of HPDC aluminum alloy based on a shear-modified GTN damage model. Eng Fract Mech2023; 291: 109541.
33.
WangGHuaTYaoJ, et al.Effects of micron-sized Si particles on the static and dynamic mechanical properties and fracture behavior of Al-xSi alloy sheets. J Alloys Compd2024; 1010: 177746. https://doi.org/10.1016/j.jallcom.2024.177746
34.
LuJ-QYangZFanK-H, et al.Characteristics and mechanical properties of retractable pin-tool friction stir welded joints of A356-alloy LPDC hollow hubs. Mater Charact2024; 210: 113707.
