Quench Factor Analysis for Predicting Precipitation Hardening of Sheets from Aluminum Alloy V-1341 of the Al – Mg – Si System

Metal Science and Heat Treatment - Prediction of precipitation hardening of sheets from aluminum alloy V-1341 of the Al – Mg – Si system with the help of mathematical modeling is...     

Properties of shaped castings made of modern cast VML18 and VML20 magnesium alloys manufactured by new methods

The methods of casting of modern magnesium alloys (corrosion-resistant Mg–Al–Zn VML18 alloy and a high-strength Mg–Zn–Zr VML20 alloy) into the temporary molds made of cold-hardening mixtures and the molds produced by 3D printing are considered. The mechanical properties (ultimate tensile strength, yield strength, impact toughness), the corrosion properties, and the microstructure of the ingots are studied. The experimental results are used to choose the molds and the methods of casting of the parts of the control system of advanced aircrafts, which are made of modern cast magnesium alloys VML18 and VML20.     

Special features of the weldability of a new wrought VMD16 magnesium alloy

ABSTRACT

The results of the investigation of the weldability of a new VMD16 magnesium alloy by automatic argon-shielded arc welding and friction stir welding are presented. The friction stir welding technology was investigated for the first time for the Russian magnesium wrought alloy. The data obtained in the studies of the phase composition and structure of the VMD16 alloy are presented. The experimental results show that the intermetallic phases (Mg, Zn)₅REE (REE = rare-earth elements) and Zn₂(Zr, REE)₃ and the Laves phases ZrZn₂, together with the fine-grained and equiaxed structure (the grain size 8–12 µm), result in a high level of the strength characteristics of the alloy and of welded joints in the alloy. It is also shown that the alloy is characterized by higher (two to six times) resistance to the formation of cracks in welding than the standard magnesium alloys MA2-1, MA2-1pch and MA20. The strength of the welded joints in the VMD16 alloy equals 0.85–0.88 of the strength of the parent material. Postweld heat treatment is not required.     

Study of the Effect of Alloying and Hot Deformation on Properties of Small Stampings of Alloys Based on TiAl Intermetallic

Metallurgist - Intermetallic alloys based on TiAl compound are most promising high-temperature materials for gas turbine engines. The effect of alloying TiAl with active elements together with hot...     

Comparative Study of the Effect of Isothermal Exposure on Metastable β-Titanium Alloy Mechanical Properties

Metallurgist - A comparative study of chemical composition, structure, and mechanical properties (Rockwell hardness, HRC) is conducted for pseudo-β-titanium alloys for structural purposes...     

Effect of the phase composition on the properties of a complex magnesium alloy at temperatures from –70 to +300°C

The phase composition and the structural evolution of an Mg–Zn–Zr alloy containing REM are studied in comparison with the commercial MA14 alloy. It is found that the phases formed with REM exhibit high thermal stability. An equiaxial and fine-grained structure and a favorable morphology of the phases provide a high level of the properties of the new alloy with respect to the properties of the commercial MA14 alloy over the wide temperature range from –70 to +300°C.