The Study on Microstructures and Properties of the Direct Squeeze Casting Al-Zn-Mg-Cu-Zr-Sc Alloy

2013 ◽  
Vol 652-654 ◽  
pp. 2455-2459 ◽  
Author(s):  
Zhi Gang Wang ◽  
Jun Xu ◽  
Zhi Feng Zhang ◽  
Bao Li ◽  
Da Quan Li
Keyword(s):  
Mechanical Property ◽  
Trace Elements ◽  
Squeeze Casting ◽  
Gravity Casting ◽  
Microstructure And Properties ◽  
Probability Of Occurrence ◽  
Shrinkage Cavities ◽  
Defect Microstructures ◽  
Zr Alloy ◽  
Zr Alloys

Trace elements Sc was added to the Al-Zn-Mg-Cu-Zr alloys, the differences of the microstructure and properties using gravity casting and squeeze casting are compared. The result shows that through the addition of trace elements Sc, the Al-Zn-Mg-Cu-Zr alloys casting microstructure was refined effectively, dendrite segregation was alleviated and the mechanical property of alloy was enhanced. Using squeeze casting forming could improve the compactness of the alloys, decrease the probability of occurrence of shrinkage cavities, porosity and segregation, in addition, the grain could be refined by the pressure forced on the alloy melt. Combined the element Sc microalloying and squeeze casting used in Al-Zn-Mg-Cu-Zr alloy forming, we could get the casting with uniform, compact, little defect microstructures. This combination could provide a new way to the Al-Zn-Mg-Cu-Zr alloy forming.

The Microstructure and Properties of Extruded Mg-Nd-Gd-Zn-Zr Alloy

2012 ◽  
Vol 554-556 ◽  
pp. 465-471
Author(s):  
Yong Dong Xu ◽  
Sheng Sun Hu ◽  
Jing Jiang Nie ◽  
Jun Wang ◽  
Rong Wang ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Aging Process ◽  
Squeeze Casting ◽  
Aging Treatment ◽  
Hot Extrusion ◽  
Strength Increase ◽  
Secondary Phases ◽  
Dislocation Interaction ◽  
Microstructure And Properties ◽  
Zr Alloy

The extruded microstructure and properties of Mg-2.7Nd-1.2Gd-0.4Zn-0.3Zr alloy by squeeze casting were investigated. After aging process (T5), the dislocation density was enhanced and the dislocation interaction was increased; the factors of grain refinement, RE phases redistribution, the increment of dislocations and the interaction between dislocations and precipitate phases were contributed to the strength increase after hot extrusion and aging treatment, the fracture mode of the hot-extruded alloy was the fracture of the secondary phases and the trans-grain fracture.

Osteoconductivity of Superhydrophilic Ti- and Zr-Alloy for Biomedical Application

2016 ◽  
Vol 879 ◽  
pp. 2524-2527
Author(s):  
Masazumi Okido ◽  
Kensuke Kuroda
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Strong Influence ◽  
Biomedical Application ◽  
Hydrophobic Surface ◽  
Hydrophilic Surface ◽  
Water Contact ◽  
Zr Alloy ◽  
Zr Alloys

Surface hydrophilicity is considered to have a strong influence on the biological reactions of bone-substituting materials. However, the influence of a hydrophilic or hydrophobic surface on the osteoconductivity is not completely clear. In this study, we produced super-hydrophilic and hydrophobic surface on Ti-and Zr-alloys. Hydrothermal treatment at 180 oC for 180 min. in the distilled water and immersion in x5 PBS(-) brought the super-hydrophilic surface (water contact angle < 10 (deg.)) and heat treatment of as-hydrothermaled the hydrophobic surface. The osteoconductivity of the surface treated samples with several water contact angle was evaluated by in vivo testing. The surface properties, especially water contact angle, strongly affected the osteoconductivity and protein adsorbability, and not the surface substance.

Microstructure and properties of Cu-Cr-Zr alloy with columnar crystal structure processed by upward continuous casting

2022 ◽  
Vol 889 ◽  
pp. 161700
Author(s):  
Jinshui Chen ◽  
Xiangpeng Xiao ◽  
Dawei Yuan ◽  
Chengjun Guo ◽  
Hao Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Continuous Casting ◽  
Columnar Crystal ◽  
Microstructure And Properties ◽  
Zr Alloy

Inoculation and Fading of Sr-Modified A356.2 Aluminum Alloy in Squeeze Casting

2016 ◽  
Vol 850 ◽  
pp. 671-678
Author(s):  
Jian Wei Niu ◽  
Lie Jun Li ◽  
Hai Jun Liu ◽  
Ji Xiang Gao ◽  
Chuan Dong Ren
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Aluminum Alloy ◽  
Hydrogen Absorption ◽  
Deleterious Effect ◽  
Squeeze Casting ◽  
Eutectic Silicon ◽  
Direct Reading ◽  
Air Bag ◽  
Fading Rate

The inoculation and fading behavior of Sr-modified aluminum alloy A356. 2 were studied for air bag bracket produced by squeeze casting. The effects of Sr, P, B contents and casting temperature on the microstructure and eutectic silicon morphology in different periods of inoculation were investigated by SEM and direct-reading Spectrometer. The influence of inoculation fading rate and addition of Sr on the casting mechanical properties and hydrogen absorption was studied. The experimental results showed that the inoculation process was completed in 1 h, and the eutectic silicon morphology can be maintained in almost subsequent 40 h after the addition of Sr. The fading rate decreased appreciably with the increase of casing temperature, P and B contents. The deleterious effect of the inoculation fading of Sr on the casting mechanical property can be compensated by the squeeze casting.

scholarly journals Microstructure and properties of Cu–Ni–Si–Zr alloy after thermomechanical treatments

Rare Metals ◽  
2013 ◽  
Vol 32 (2) ◽  
pp. 144-149 ◽  
Author(s):  
Xiang-Peng Xiao ◽  
Bai-Qing Xiong ◽  
Qiang-Song Wang ◽  
Guo-Liang Xie ◽  
Li-Jun Peng ◽  
...  
Keyword(s):  
Microstructure And Properties ◽  
Zr Alloy

Microstructure and properties of spray cast CuZr alloys

1991 ◽  
Vol 145 (2) ◽  
pp. 243-255 ◽  
Author(s):  
Rishi P. Singh ◽  
Alan Lawley ◽  
Sam Friedman ◽  
Y.V. Murty
Keyword(s):  
Microstructure And Properties ◽  
Zr Alloys

Effects of Y on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Magnesium Alloys

2017 ◽  
Vol 904 ◽  
pp. 29-35
Author(s):  
Da Yu Wang ◽  
Zhi Ming Du ◽  
Hong Juan Zhang ◽  
Li Hua Chen ◽  
Chang Shun Wang
Keyword(s):  
Mechanical Property ◽  
Grain Refinement ◽  
Mass Fraction ◽  
Atomic Ratio ◽  
Extension Rate ◽  
Precipitated Phase ◽  
Mold Casting ◽  
Alloy Increase ◽  
Test Result ◽  
Zr Alloys

Mg-Zn-Zr-Y billets with different mass fraction of Y (wt%(Y)=0.2%、0.5%、1.0%、1.5%、2.0%) was prepared by permanent mold casting. The increase in Y content has shown grain refinement effects on the microstructure morphologies of Mg–Zn–Y–Zr alloys. When the content of Y achieves 1.0 wt%, the grain refinement effect of the Y is most obvious than any more contents of the Y content. In the test result of XRD, the type of precipitated phase in Mg-Zn-Zr-Y alloys is related to atomic ratio of Y/Zn. With content of Y increases, atomic ratio of Y/Zn increases,the precipitated phase in alloy is changed from Phase I to Phase W. Tensile strength and extension rate of alloy increase with the increasing of Y content; When Y content reaches 1.0%, mechanical property reaches maximum value.When content of Y exceeds 1.0%, with the increasing of Y content, mechanical property of alloy declines gradually.

scholarly journals Mechanical and Thermal Conductivity Properties of Enhanced Phases in Mg-Zn-Zr System from First Principles

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2010
Author(s):  
Shuo Wang ◽  
Yuhong Zhao ◽  
Huijun Guo ◽  
Feifei Lan ◽  
Hua Hou
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Intermetallic Compounds ◽  
Elastic Constants ◽  
First Principles ◽  
Strengthening Phases ◽  
Zr Alloy ◽  
Zr Alloys

In this paper, the mechanical properties and minimum thermal conductivity of ZnZr, Zn2Zr, Zn2Zr3, and MgZn2 are calculated from first principles. The results show that the considered Zn-Zr intermetallic compounds are effective strengthening phases compared to MgZn2 based on the calculated elastic constants and polycrystalline bulk modulus B, shear modulus G, and Young’s modulus E. Meanwhile, the strong Zn-Zr ionic bondings in ZnZr, Zn2Zr, and Zn2Zr3 alloys lead to the characteristics of a higher modulus but lower ductility than the MgZn2 alloy. The minimum thermal conductivity of ZnZr, Zn2Zr, Zn2Zr3, and MgZn2 is 0.48, 0.67, 0.68, and 0.49 W m−1 K−1, respectively, indicating that the thermal conductivity of the Mg-Zn-Zr alloy could be improved as the precipitation of Zn atoms from the α-Mg matrix to form the considered Zn-Zr binary alloys. Based on the analysis of the directional dependence of the minimum thermal conductivity, the minimum thermal conductivity in the direction of [110] can be identified as a crucial short limit for the considered Zn-Zr intermetallic compounds in Mg-Zn-Zr alloys.

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