Lightweight, High Strength, Corrosion Resistant Magnesium Lithium Alloy Lz91

Product Description

Magnesium Lithium Alloy LZ91

Product introduction:
LZ91 is a typical commercial magnesium-lithium alloy with low density, medium strength, good shaping and good corrosion resistance. The density is equivalent to plastic, rigidity and toughness are much higher than plastics, and it has excellent shock absorption, damping and plasticity. It can be applied to sound film foil and is one of the most effective materials for weight reduction in aerospace metal materials. It can be applied to secondary load-bearing parts and various boxes and shells, such as electronic chassis shells, optical instrument structural parts, skins, dashboards, satellite rivets, honeycomb panels, heat pipes, notebook shells, mobile phone shells, sighting devices and the shell, etc.
Magnesium-lithium alloy LZ91 technical parameters
1.Magnesium-lithium alloy LZ91 chemical composition

Li	Zn	Mn	Si	Fe	Cu	Ni	Mg
8.5-9.5	0.5-1.5	≤0.05	≤0.05	≤0.01	≤0.05	≤0.005	Bal.

2.Magnesium-lithium alloy LZ91 physical properties

Density(g/cm3)	1.48
Solidus temperature(ºC)	570
Liquidus temperature(ºC)	582
Elastic Modulus(GPa)	43
Poisson's ratio	0.33
Thermal Conductivity(W/mK)(25ºC)	50-80
Thermal expansion coefficient(10-6/K)(25ºC)	28-32
Internal friction coefficient	0.01-0.05
Specific damping coefficient(10-4)	68-340

3. Magnesium-lithium alloy LZ91 mechanical property standard

Temper		Specification/mm	Tensile strength/MPa	Yield Strength/MPa	Elongation /%
Forging	O	≤100	≥110	≥90	≥25
	H112		≥120	≥95	≥25
Extrusion	H112	≤20	≥145	≥100	≥30
		>20~50	≥135	≥95	≥25
		>50~190	≥130	≥90	≥25
Rolled plate	O	0.40~3.00	≥130	≥95	≥25
		>3.00~12.50	≥125	≥95	≥25
		>12.50~20.00	≥120	≥90	≥20
	H112	2.00~12.50	≥135	≥100	≥25
		>12.50~70.00	≥130	≥95	≥20

4.Magnesium lithium alloy LZ91 measured value of mechanical properties

Temper		Specification/mm	Tensile strength/MPa	Yield Strength/MPa	Elongation /%
Forging	O	76mm	117	96	37.5
	H112		133	103	32.5
Extrusion	H112	φ16	157	109	47.5
		φ22	151	101	38.0
		φ190	140	96	35.5
Rolled plate	O	2.5	141	113	48.0
		8	139	107	44.5
		15	134	96	42.0
	H112	3	142	114	43.5
		45	136	106	38.0

 Magnesium-lithium alloy features:
1. Ultralight: The lightest metal structure material in the world, with a density of 1.35-1.65g/cm3, which is 1/2 lighter than aluminum alloy and 1/3 lighter than magnesium alloy.
2. Excellent rigidity: The rigidity is 22 times that of steel; the weight of magnesium and lithium required for the same rigidity is only 1/3 of that of steel.
3. Superplasticity: The tensile elongation rate of magnesium-lithium at high temperature can reach 758%. The superplastic forming process can obtain thin-walled parts with precise size, complex shape and uniform grain structure.
4. Good electrical and thermal conductivity: The thermal conductivity is about 300 to 400 times that of plastics, which is 30-50 times that of carbon fiber composite materials, and the electrical conductivity is about 1016 times that of plastics and 104 times that of carbon fiber composite materials.
5. Excellent shock absorption performance: With a large internal friction coefficient, energy can be consumed inside the metal, which can effectively improve the stability of the equipment, and is suitable for making equipment with shock absorption requirements, such as aerospace shock absorption parts, tank.
6. Excellent electromagnetic shielding performance: Magnesium lithium alloy has a good shielding effect on electromagnetic waves of different bands. It is suitable for making gyroscope shells, shielding shelters, anti-interference control cabinets, etc., to improve the safety of equipment, accuracy.
7. Good welding performance: Magnesium lithium is easy to weld with the body alloy and other magnesium alloys. Laser welding, friction stir welding, TIG welding, electron beam welding and brazing can be used for welding.
8. Excellent machining performance and cold forming ability: Magnesium-lithium machining performance is excellent, the surface quality is good, the cutting force is small, and the energy consumption is low. The cold working performance is very excellent, the total cold rolling processing rate can reach 90%, and it can be stamped and formed at room temperature.


Application area:

1. Aerospace industry: Magnesium alloy materials can greatly reduce the weight and fuel cost of aircraft by virtue of their light weight. The reduction of aircraft weight can improve aircraft maneuverability and combat effectiveness. The excellent shock absorption performance of magnesium-lithium alloy can reduce the problems of engine operation and aerodynamic noise caused by missiles, carrier rockets and aircraft in flight.
2. Military field: Magnesium alloy is used as a lightweight structural material, and magnesium-lithium alloy is used to replace aluminum alloy and titanium alloy, which can achieve a weight reduction effect of 20% to 40%.
3. 3C field: Magnesium-lithium alloy has good cold working performance, can realize room temperature stamping forming, and is widely used in electronic products such as computers and communication equipment. In addition, magnesium-lithium alloy also has excellent electromagnetic shielding performance. The use of magnesium-lithium alloy to prepare notebook LCD screen frames, back shells, keyboard frame shells and other parts can reduce weight, enhance heat dissipation, and increase impact resistance. Electromagnetic interference makes the transmitted data more real and accurate.

Detailed Photos