Correlation between the microstructure and machinability in machining Al–(5–25) wt% Si alloys

Zhang, Peirong; Wang, Qingqing; Du, Jinhui; Su, Guosheng; Zhang, Jingjie; Sun, Yujing

doi:10.1177/0954405420911275

Cited by 11 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These alloys are used in a variety of automotive and aerospace components due to their good castability and fluidity properties, as well as a combination of high ductility, high specific strength, high corrosion and wear resistance. [1][2][3] A356 (Al-7Si), a hypo-eutectic alloy from the Al-Si-Mg system, is used widely in recent decades for vehicularengine block/head applications due to its excellent casting ability, high strength/weight ratio and excellent heat-treatable characteristics. 4,5 Cooling rate, modification and heat treatment are the three factors that influence the silicon morphology.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and reciprocal dry sliding wear behaviour of as-cast and heat-treated TiN/Al-7Si functionally graded composite

Radhakrishnan

Radhika

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

This work explores the effect of T6 heat-treatment on the microstructure, mechanical properties and dry sliding linear reciprocating wear behaviour of Al-7Si/Titanium Nitride (TiN) centrifugally cast functionally graded composite. The 10 wt% TiN particle addition and subsequent eutectic Si spheroidisation due to heat treatment revealed an improvement in microhardness, tensile strength and wear resistance of heat-treated composite when compared to as-cast composite. Reciprocating wear analysis at varying applied loads and sliding distances revealed a combination of specimen micro-ploughing and abrasive particle action at low load and sliding distances, which was in stark contrast to the combination of abrasive and adhesive wear at higher loads and sliding distances. The surface was characterised by mechanically mixed layer formation due to tribo-oxidation, adhesive and delamination wear mechanisms. This composite can be utilised to replace traditional materials employed in reciprocating pump and compressor applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and reciprocal dry sliding wear behaviour of as-cast and heat-treated TiN/Al-7Si functionally graded composite

Radhakrishnan

Radhika

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…Tool wear and Ra increase due to high amount of hard Si particles, 15 Basavakumar et al 16 and Bayraktar and Afyon 17 determined that built up edge (BUE) consisted of by welding the material to the cutting edge due to friction and pressure between the cutting tool and the workpiece. Zhang et al 18 found that the cutting stability of Al-Si based alloys increased with Si content in the range of 12wt.%–18wt.% by weight and decreased by 25 wt.% Si by weight, and that the chip breakability increased with increasing of Si content and cutting speed. Kamiya et al observed that the chip breakability and surface quality increased due to the increase in Si content in eutectic compositions, while tool life decreased.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on machinability characteristics of Al-9Si alloy: Effect of Sr and Mg additives

Hekìmoğlu

Bayraktar

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

In this study, the effects of strontium (Sr) and magnesium (Mg) elements in certain rates added to Al-9Si alloy manufactured using permanent mold casting technique on the structural, mechanical, and machinability properties of these alloys were investigated. While microstructural images of the alloys were obtained with an optical microscope, hardness, tensile strength, and elongation to fracture were determined by conventional methods. The resultant cutting force ( F) and average surface roughness ( Ra) were measured as experimental outputs in the turning process. It was observed that Al-9Si alloy comprised of α-Al, eutectic Al-Si, β, and primary Si phases. The addition of Sr to the Al-9Si alloy led to the formation of the Al4Sr phase and the transformation of the β phase into the δ phase. The addition of Mg to Al-9Si-0.1Sr alloy caused the δ phase to transform into the π phase. The hardness of the tested alloy increased significantly with the Mg addition. The yield strength and tensile strength of them increased with both Sr and Mg additions. On the other hand, elongation to fracture value of the Al-9Si alloy increased with Sr addition while it decreased with the Mg addition. The F and Ra values obtained from the Al-9Si alloy increased with Sr addition in the turning process while decreased with Mg addition. The results obtained from turning tests were discussed based on the mechanical properties of alloys.

show abstract

“…Therefore, machining is essential in several cases. Some researchers have experimentally investigated the machinability of Al-Si alloys [12][13][14]. However, the effect of machinability on the surface characteristics by varying the percentage of Si in Al-Si automotive alloys is not fully understood yet specially in milling operation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Machined Surfaces of Al-based Automotive Alloys with Different Levels of Si Content under Up Milling and Down Milling Operation

Ahammed¹,

Razin²,

Al-Nur³

et al. 2022

AMS

View full text Add to dashboard Cite

This paper aims to investigate and compare the characteristics of machined surfaces and chips formation of aluminium-based automotive alloys with varying silicon content. The milling operations are performed using horizontal milling machine under two peripheral up milling and down milling methods with an HSS slab milling cutter. The experiment has conducted for different cutting speeds in dry condition while the depth of cut and machining feed are kept constant throughout the evaluation. The study reveals that the down-milled surface has higher hardness and better surface finish resulting in lower roughness as the cutting force is compressive in nature. On the contrary, the up-milled surface has lower hardness and micro cracks on it, which resulted in relatively higher surface roughness as the cutting force is tensile shear in nature. In addition, the surface hardness increases with the increment of silicon content in the alloys for both milling methods for the presence of hard Si rich intermetallics. The chips produced during up milling are shorter whereas the chips produced during down milling are longer for creation of higher temperature and pressure. Higher Si added alloy shows the curly like chips for its lower elongation behaviour. Fracture behaviour of higher Si alloy also confirms crack propagation obtained by the massive cleavage of the brittle and plate-types Si rich intermetallics.

show abstract

Correlation between the microstructure and machinability in machining Al–(5–25) wt% Si alloys

Cited by 11 publications

References 35 publications

Microstructure, mechanical properties and reciprocal dry sliding wear behaviour of as-cast and heat-treated TiN/Al-7Si functionally graded composite

Microstructure, mechanical properties and reciprocal dry sliding wear behaviour of as-cast and heat-treated TiN/Al-7Si functionally graded composite

Experimental research on machinability characteristics of Al-9Si alloy: Effect of Sr and Mg additives

Characterization of Machined Surfaces of Al-based Automotive Alloys with Different Levels of Si Content under Up Milling and Down Milling Operation

Contact Info

Product

Resources

About