Cunlong Wang

• PhD
• Professor (Associate) at Jiangsu University

The unclear contraction behavior of Mg-Gd-Y-Zr alloy during low-pressure sand casting bring obstructs into the dimensional control in the fabrication of large and complex parts, restricting the further engineering applications of this alloy. This paper investigated the rule for free and constrained contraction of typical Mg-Gd-Y-Zr (Mg-9Gd-3Y-0.5Zr...

Asymmetric hot rolling was used to fabricate the high-strength Mg-9Gd-4Y–1Zn-0.8Mn (wt.%) alloys, which is strengthened by the lamellar long-period stacking ordered (LPSO) phases inside grains and the block-shaped LPSO phases surrounding grain boundaries. The reduction in total thickness shows a significant impact on the microstructure, texture, an...

The performance of large-size structural components with varied wall thickness is mainly determined by the quench sensitivity, while there was a blank of the studies on the quench sensitivity of cast Al-Li alloys. In this study, the precipitation behavior of sand-cast Al-2Li-2Cu-0.5Mg-0.15Sc-0.15Zr-0.05Ti alloy subjected to different quenching cond...

A novel method named low frequency electro-magnetic stirring assisted near-liquidus squeeze casting (LFEMS-NSC) was developed for preparing Mg-RE alloy castings. The grain refining effect in commercially pure Mg (CP-Mg), peritectic Mg-Zr alloy and eutectic Mg-Gd alloy were comparatively analyzed among conventional gravity cast, squeeze cast and LFE...

The present paper has reported a comparative study on the influence of environmental temperature on the microstructural evolution and tensile mechanical behaviors between squeeze cast (SC) and gravity cast (GC) Mg-10Gd-3Y-0.5Zr (GW103K) alloys. The results revealed that for both alloys, the operative deformation mechanisms at testing temperatures (...

In this paper, the influence of nanoparticle fraction on Portevin-Le Chatelier effect of ZrB2 nanoparticle reinforced AA6xxx composites was investigated and friction stir processing was used to uniformize the distribution of nanoparticles. The results indicated that the population of serrations decreases with increasing the fraction of ZrB2 particl...

The Mg-8Gd-4Y–1Zn–Mn (wt%) alloys prepared by semi-continuous casting and homogenizing treatment were extruded using different extrusion ratios and subsequent cooling processes. The microstructure, texture and mechanical properties of extruded alloys were investigated. The dynamic recrystallization process is promoted by increasing the extrusion ra...

During the past decades, with the increasing demands in lightweight structural materials, Mg alloys with low density and high performance have been extensively investigated and partly applied in some industries. Especially when rare earth (RE) elements are added as major alloying elements to Mg alloys, the alloy strength and creep resistance are gr...

In this work, the in-situ ZrB2/AA6111 composites with different particle volume fractions were prepared by direct melt reaction method and followed by hot extrusion deformation and T6 heat treatment. The microstructure characteristics, tensile and fatigue properties were carefully studied. The results showed that the addition of nano-ZrB2 particles...

The pure copper sheets were rolled with a small strain in one pass at cryogenic and room temperature, respectively. The total thickness was reduced by 55% through three rolling passes. The microstructural evolution and mechanical properties of Cu sheets were investigated by metallographic characterizations, tensile tests and fracture analysis. It i...

The proper alloy composition ranges for rheo-forming of Mg-RE alloy was obtained through thermodynamic calculations. The low frequency electromagnetic stirring (LFEMS) process was used to fabricate semisolid slurries of Mg-Gd-Zn series alloys, and the role of solute Gd content and the cooling rate in the LFEMS process were systematically investigat...

2 vol.% ZrB2/2024Al nanocomposite with a hierarchical microstructure was successfully fabricated by hot extrusion and T6 treatment. Experimental observations reveal that most ZrB2 assembled into fiber-like nanoparticle-rich bands and others were uniformly dispersed in the matrix. As expected, the unique structure resulted in remarkable strength imp...

The microstructures and mechanical properties of cast and extruded Al-4Cu-1Li-0.4Mg-0.1Zr-xZn alloys were investigated and the amount of Zn additions was up to 1.1 wt%. The results showed that Zn addition could bring additional MgZn2 phases at the grain boundary and slightly refine the grain size in the as-cast alloy. The mechanical properties of e...

The mold shell used for single-crystal turbine blades preparation was modified from conventional process to fiber reinforcement technology. The wall thickness was decreased by 32.3 percent (pct) than the conventional process. Then these two mold shells were used to produce single crystal samples of nickel-base superalloy in a Bridgman furnace. The...

The effect of cooling rate on the transition of dendrite morphology of a Mg-6Gd (wt%) alloy was semiquantitatively analyzed under a constant temperature gradient by using synchrotron X-ray radiographic technique. Results show that equiaxed dendrites, including exotic 'butterfly-shaped' dendrite morphology, dominate at high cooling rate (>1 K/s). Wh...

The effects of solution heat treatment and aging on the microstructural evolution and mechanical behavior of a squeeze-cast (SC) Mg–10Gd–3Y–0.5Zr (GW103K) alloy, processed using various applied pressures (e.g., 0.1, 40, 80 and 160 MPa) were systematically investigated. Our results show that, after solution heat treatment, secondary phases and press...

We report a kind of porous magnesium with entangled architectured pore structure for potential applications in biomedical implant. The pore size, spatial structure and Young׳s modulus of the as-prepared porous Mg are suitable for bone tissue engineering applications. Particularly, with regard to the load-bearing conditions, a new analytical model i...

The influence of applied pressure and pouring temperature on the microstructure and mechanical properties of a squeeze cast (SC) Mg-10Gd-3Y-0.5Zr (GW103K) alloy was systematically investigated. Our results show that increasing the applied pressure leads to microstructure refinement of the GW103K alloy with accompanying enhancement of tensile yield...

The degradation behavior of the porous titanium with entangled structure filled with biodegradable magnesium (p-Ti/Mg) in Hanks' solution was investigated. It was found that the p-Ti/Mg composite had higher strength than pure magnesium and porous titanium with entangled structure (p-Ti). Although the magnesium in p-Ti/Mg was completely dissolved in...

A kind of graded porous titanium–magnesium (Ti–Mg) composite, i.e., about 1–1.5 mm thick porous Ti layer is wrapped over the internal dense Ti–Mg composite, has been successfully fabricated by infiltration casting and acid etching. The outer porous Ti layer maintains its initial entangled structure, which can be easily adjusted to the ideal porosit...

A kind of Ti–Mg composite was prepared by infiltrating the biodegradable magnesium melt into the porous titanium (p-Ti) with entangled structure. The microstructure and the mechanical properties of the composites were investigated by using the metallographic technique and the compressive testing method. The novelty in the elastic property was discu...

The effect of Al additions on grain refinement and mechanical properties of Mg–Sm alloys has been investigated. The addition of 3 wt.% Al led to significant grain refinement of Mg–x Sm (x = 4, 6 and 8 wt.%) alloys due to the formation of Al2Sm particles which acted as active nucleant particles for the Mg matrix. An orientation relationship (1¯11)Al...

In this paper, a new magnesium alloy Mg-12Zn-4Al-0.5Ca (ZAX12405) was prepared by squeeze casting. The effects of processing parameters including applied pressure, pouring temperature and dwell time on the microstructure and mechanical properties of squeeze-cast ZAX12405 alloy were investigated. It was found that squeeze-cast ZAX12405 alloy exhibit...