Search results for: W.Q. Jie

Items from 1 to 9 out of 9 results

article

Microstructure and mechanical properties of sand mold cast Mg–4.58Zn–2.6Gd–0.18Zr magnesium alloy after different heat treatments

S.J. Liu, G.Y. Yang, S.F. Luo, W.Q. Jie

Journal of Alloys and Compounds > 2015 > 644 > C > 846-853

Microstructure and mechanical properties of sand mold cast Mg–4.58Zn–2.6Gd–0.18Zr magnesium alloy after different heat treatments were investigated. As-cast alloy was composed of α(Mg) matrix, interdendritic α(Mg)+W(Mg₃Zn₃Gd₂) eutectic, icosahedral quasicrystalline I(Mg₃Zn₆Gd) phase and Mg₃Gd particles within α(Mg) matrix. After solution treatment at 505°C for 16h, most of α(Mg)+W(Mg₃Zn₃Gd₂) eutectic...

article

Microstructure evolution during heat treatment and mechanical properties of Mg–2.49Nd–1.82Gd–0.19Zn–0.4Zr cast alloy

S.J. Liu, G.Y. Yang, S.F. Luo, W.Q. Jie

Materials Characterization > 2015 > 107 > C > 334-342

Microstructure evolution during heat treatment and mechanical properties of Mg–2.49Nd–1.82Gd–0.19Zn–0.4Zr cast alloy were investigated experimentally in different stages of heat treatment process. As-cast alloy was found to be consisting of dendritic α(Mg) grains, interdendritic α(Mg)+Mg₁₂Nd eutectic. Within α(Mg) grains, needle-like Mg₁₂Nd phase, quadrate-like Mg₅Gd phase and α(Zr) particles were...

article

Effects of H₂ Atmosphere Annealing on the Properties of CZT:In Single Crystals

P.F. Yu, W.Q. Jie

Journal of Electronic Materials > 2013 > 42 > 12 > 3385-3389

To improve crystal quality and detector performance, high-resistivity cadmium zinc telluride (CZT):In single crystals were annealed in H₂. The concentration of Te inclusions did not change after annealing. Both the resistivity and infrared transmittance increased as the annealing time increased, indicating improvement of crystal quality. Because of the passivation by hydrogen, some interesting phenomena...

article

Precipitation microstructure and their strengthening effects of an Mg–2.8Nd–0.6Zn–0.4Zr alloy with a 0.2wt.% Y addition

J.H. Li, G. Sha, W.Q. Jie, S.P. Ringer

Materials Science & Engineering A > 2012 > 538 > Complete > 272-280

A micro-alloy addition of Y (0.2wt.%) produced a significant improvement in the tensile yield strength of an Mg–2.8Nd–0.6Zn–0.4Zr (wt.%) alloy at 200°C, with a 28% increase from 143MPa to 183MPa. APT characterisation confirmed that small solute clusters in a high number density were present in the as-quenched sample. TEM examinations revealed that β-type precipitates habiting on prism {1 1 2¯ 0} planes...

article

Precipitation microstructure and age-hardening response of an Mg–Gd–Nd–Zn–Zr alloy

J.H. Li, G. Sha, T.Y. Wang, W.Q. Jie, more

Materials Science & Engineering A > 2012 > 534 > Complete > 1-6

Precipitates in an Mg–3.6Gd–2.8Nd–0.6Zn–0.4Zr (wt.%) alloy aged for times up to 70h at 200°C have been characterised using transmission electron microscopy and atom probe tomography. The precipitate phases known as β″, β′ and β ₁ occur during this ageing. The solute elements Nd, Zn and Gd partition significantly into these precipitates. The enhanced ageing hardening response after aged 70h...

article

Hardening and microstructural reactions in high-temperature equal-channel angular pressed Mg–Nd–Gd–Zn–Zr alloy

G. Sha, J.H. Li, W. Xu, K. Xia, more

Materials Science & Engineering A > 2010 > 527 > 20 > 5092-5099

The use of high-temperature (330°C) equal-channel angular pressing (ECAP) is demonstrated to promote precipitation of a fine and uniform dispersion of the FCC β ₁ phase in an Mg–Nd–Gd–Zn–Zr alloy. Significantly, this process induces a hardening reaction in the alloy, where isothermal ageing at this temperature leads only to softening. The evolution of microstructure is characterized using...

article

Structural Evidence for the Transition from Coupled to Decoupled Growth in the Solidification of Undercooled Ni-Sn Eutectic Melt

J.F. Li, W.Q. Jie, S. Zhao, Y.H. Zhou

Metallurgical and Materials Transactions A > 2007 > 38 > 8 > 1806-1816

Ni-18.7 at. pct Sn eutectic melt was undercooled and spontaneously solidified in the encasement of a glass flux. Structure morphologies of the sample surface as well as inside the sample were systematically examined, and a critical undercooling of 130 K was clearly revealed for the alloy. Below the critical undercooling, coupled lamellar eutectics (α-Ni and β-Ni₃Sn) dendritically grow in the undercooled...

article

Effects of Cd compensation on the photoluminescence of Cd_1-xZn_xTe single crystals grown by the modified Bridgman method

G. Yang, W.Q. Jie

Applied Physics A > 2006 > 85 > 4 > 457-460

In order to deal with the phenomenon of Cd evaporation during the growth of Cd_1-xZn_xTe (x=0.1) crystals, Cd compensation was adopted during the growth by adding excess Cd into the raw materials. Photoluminescence (PL) spectra were used to investigate the effects of Cd compensation on the properties of Cd_1-xZn_xTe. A free exciton (FE) peak appeared in the near band-edge region after Cd compensation,...

article

Solidification structure formation in undercooled Fe-Ni alloy

J.F. Li, W.Q. Jie, G.C. Yang, Y.H. Zhou

Acta Materialia > 2002 > 50 > 7 > 1797-1807

The Fe alloy melts containing 7.5, 15, 22.5 and 30 at% Ni were bulk undercooled to investigate the structure evolution. When the undercooling of the four melts is lower than the critical value 110, 125, 175 and 325 K, respectively, only the stable face-centered cubic phase crystallizes. In this case a grain refinement caused by solid superheating is observed in all the alloys, but another grain refinement...

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