Microstructure, precipitates and hardness of selectively laser melted AlSi10Mg alloy before and after heat treatment

Zhou, Le; Mehta, Abhishek; Schulz, Esin; McWilliams, Brandon; Cho, Kyu; Sohn, Yong Ho

doi:10.1016/j.matchar.2018.04.022

Cited by 225 publications

(89 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where VH is Vickers hardness in MPa ( VH MPa = VHN × 9.807 ). n is the strain hardening coefficient selected are 0.2 and 0.1, for the as-printed and the heat treated AlSi10Mg materials, respectively [12,14]. Considering this equation, the average yield strength for the as-printed and heat treated materials are 245.1 MPa and 188.7 MPa, respectively.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Alghamdi

Haghshenas

2019

SN Appl. Sci.

View full text Add to dashboard Cite

Additive manufacturing of aluminum alloys is considered a promising layer-wise manufacturing method which can produce lightweight critical automotive/aerospace/military components with enhanced physical and mechanical properties. This paper aims at assessing the correlation between microstructure and small-scale characteristics of an additive manufactured AlSi10Mg alloy in the as-printed and heat treated conditions. Depth-sensing nanoindentation testing, as a non-destructive, robust, and convenient testing approach, along with microstructural assessments, using optical microscopy and scanning electron microscopy, were employed to compare the nano-hardness of the printed (selective laser melting method) and the heat treated (age-hardening) materials. Considering the distance from the build plate, a gradation in the cooling rate, and therefore the microstructure, is expected which directly affect the nano-hardness gradient along the deposition direction. Results show a transition in the microstructure from cellular grains, with corallike silicon fiber colonies, to fragmented/spheroidized eutectic silicon particles upon the heat treatment. Unlike conventionally manufactured AlSi10Mg alloys, upon aging heat treatment in the additive manufactured AlSi10Mg alloy, the nano-hardness is decreased which is mainly contributed to stress relief, elimination of solid solution strengthening, and silicon spheroidization phenomena. These are considered in detail in the current paper.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 99%

“…This heat treatment produces the strengthening precipitates of Mg 2 Si in the alloy which improves the ductility and strengthens the aluminum matrix. Recently some papers have been published on T 6 heat treatment of the additive manufactured AlSi10Mg alloy [3,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Alghamdi

Haghshenas

2019

SN Appl. Sci.

View full text Add to dashboard Cite

show abstract

“…Generally accepted chemical composition of precipitates formed in AlSi10Mg aluminum alloy is as follows: GP zones (Mg and Si atom clusters), β ″ and β ′ (nonstable Mg 2 Si), and β (stable Mg 2 Si) …”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of different heat treatment parameters on the corrosion and mechanical properties of the AlSi10Mg alloy produced with direct metal laser sintering

Özer

Tarakçı

Yılmaz

et al. 2019

Materials & Corrosion

View full text Add to dashboard Cite

In this study, AlSi10Mg samples produced by the direct metal laser sintering (DMLS) method were applied to heat treatment with different parameters (stress relief and T6). Heat‐treated and as‐built samples were subjected to intergranular corrosion test according to BS EN ISO 11846 standard. Hardness, tensile, electrical conductivity, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and weight loss tests were applied to the samples. The corrosion, electrical conductivity, and mechanical properties of the DMLS‐AlSi10Mg material were investigated in detail depending on the heat‐treatment parameters.

show abstract

“…These microstructural features are also found in [27] for both the HIP and SA conditions. A performed EDX-analysis on a Fe-rich precipitate, the spot marked as 'a' in Figure 5, shows a chemical composition (Al 70.24 Si 15.24 Fe 14.32 ) that calculates to Al 5 Si 1.1 Fe 1.02 and is similar to the β-phase Al 5 SiFe, reported and found in [60][61][62]. Due to the elevated temperature above the solubility temperature, silicon crystals are precipitated at the grain boundaries which grow to their respective size throughout the subsequent annealing [37,38,63].…”

Section: Microstructural Analysismentioning

confidence: 55%

Effect of Post Treatment on the Microstructure, Surface Roughness and Residual Stress Regarding the Fatigue Strength of Selectively Laser Melted AlSi10Mg Structures

Schneller

Leitner

Pomberger

et al. 2019

JMMP

View full text Add to dashboard Cite

This paper focusses on the effect of hot isostatic pressing (HIP) and a solution annealing post treatment on the fatigue strength of selectively laser melted (SLM) AlSi10Mg structures. The aim of this work is to assess the effect of the unprocessed (as-built) surface and residual stresses, regarding the fatigue behaviour for each condition. The surface roughness of unprocessed specimens is evaluated based on digital light optical microscopy and subsequent three-dimensional image post processing. To holistically characterize contributing factors to the fatigue strength, the axial surface residual stress of all specimens with unprocessed surfaces is measured using X-ray diffraction. Furthermore, the in-depth residual stress distribution of selected samples is analyzed. The fatigue strength is evaluated by tension-compression high-cycle fatigue tests under a load stress ratio of R = −1. For the machined specimens, intrinsic defects like pores or intermetallic phases are identified as the failure origin. Regarding the unprocessed test series, surface features cause the failures that correspond to significantly reduced cyclic material properties of approximately −60% referring to machined ones. There are beneficial effects on the surface roughness and residual stresses evoked due to the post treatments. Considering the aforementioned influencing factors, this study provides a fatigue assessment of the mentioned conditions of the investigated Al-material.

show abstract

Microstructure, precipitates and hardness of selectively laser melted AlSi10Mg alloy before and after heat treatment

Cited by 225 publications

References 47 publications

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Investigation of the effects of different heat treatment parameters on the corrosion and mechanical properties of the AlSi10Mg alloy produced with direct metal laser sintering

Effect of Post Treatment on the Microstructure, Surface Roughness and Residual Stress Regarding the Fatigue Strength of Selectively Laser Melted AlSi10Mg Structures

Contact Info

Product

Resources

About