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...impregnation techniques. If re-entrant angles, threads or undercuts are required, then components have to be machined. Machinability can be improved by impregnation or by additions of 0.3–0.5% manganese sulphide to the powder blend. See Also: Slip-casting, Powder forging/hot pressing, Pressureless sintering, Hot isostatic pressing, Injection moulding and Sand casting....

...aluminium die casting alloys. Magnesium- and zinc-based also can be used. Difficult-to-cast aluminium alloys can also be used for some components. Improvements in tensile strength by up to 30% are claimed. Tensile ductility can be improved from values of 1–3% (for die casting) up to 10% (for Acurad castings), e.g. Al-(6.5-7.3)Si-(0.2-0.45)Mg alloy ......

...cast mine. Oil in sand and shale How to get crude oil from the Athabasca oil sands and from Colorado oil shale - among the world's largest deposits of oil. Hidden oil reserves Describing what the Athabasca oil sands look like and the unique conditions that led to their formation. The North Sea oil bonanza Drilling in the north sea for rocks that could hold billions of...

...cast aluminium tooling except for deep drawn parts formed at higher superplastic temperatures, which require nodular cast iron. Ideal for prototype work since tooling is easily modified. Male forming allows multiple parts to be formed in one cycle, but this technique needs careful design and control of production parameters. Re-entrant parts produced using split tooling...

...cast billet, the process is very attractive if the output is sufficiently large. Complex aluminium alloy sections are forward extruded for a wide range of applications, including window-frame sections. Presses of up to 3000 tons capacity are required to extrude aluminium alloys billets up to 0.56 m in diameter at 400–500˚C. Extrusion speed varies with the type of...

...Aluminium alloys are shot peened with cast steel shot (500–750 µm) to increase fatigue strength by 35%. Low and medium carbon steels, and low alloy steel, are peened with either chilled cast iron or cast steel shot (500–1250 µm) and fatigue strengths can be increased by up to 50%. Spring steels are widely shot peened for coil- and leaf-spring applications. The...

...aluminium casting and forging (6082/2014A) alloys. Rapid cooling and grain refining lead to a fine equiaxed grain structure which imparts anisotropic properties. UTS, 0.2% proof stress and percentage elongation compared favourably with fully heat treated wrought alloys. Typical “Hyperforge” properties for heat treated (T6) alloys are: Alloy Elongation at fracture (%)...

...Sands Fish is a data scientist and a grad student at MIT, and, like most people in his demographic, he uses Facebook. But Sands took an unplanned break from the platform this summer when Facebook sent him an automated message formally requesting that he verify his name with the company, or risk having his account suspended. Indeed, Facebook requires people to display...