Titanium Zirconium Molybdenum(TZM Alloy)

What is Titanium Zirconium Molybdenum(TZM Alloy)?

TZM alloy is an alloy of 0.50% Titanium, 0.08% Zirconium and 0.02% Carbon with the balance Molybdenum. TZM alloy is manufactured by either P/M or Arc Cast technologies and is of great utility due to its high strength/high temperature applications, especially above 2000'F.

TZM alloy has a higher recrystallization temperature, higher strength, hardness and good ductility at room and elevated temperatures than unalloyed Molybdenum. In addition, TZM exhibits good thermal conductivity, low vapor pressure, good corrosion resistance and is machinable.

TZM Molybdenum has a higher recrystallization temperature, higher strength, hardness and good ductility at room and elevated temperatures than unalloyed Molybdenum. TZM offers twice the strength of pure moly at temperatures over 1300'C. The recrystallization temperature of TZM is approximately 250'C higher than moly and it offers better weldability. In addition, TZM exhibits good thermal conductivity, low vapor pressure, and good corrosion resistance and is machinable.

TZM alloy costs approximately 25% more than pure molybdenum and costs only about 5-10% more to machine. For high strength applications such as rocket nozzles, furnace structural components, and forging dies, it can be well worth the cost differential.

TZM plate image

Email: sales@chinatungsten.com sales@xiamentungsten.com 

Tel.: +86 592 5129696/86 592 5129595

Fax: +86 592 5129797

TZM Alloy and Other Molybdenum Alloys

Pure molybdenum room temperature brittle and cold-brittle transition temperature is high, which greatly limits its processing and applications. In order to expand the application range of molybdenum material, manufacturers usually add a small amount of alloying elements into molybdenum to obtain molybdenum alloy. Molybdenum alloy not only improves the toughness of molybdenum and reduce its plastic-brittle transition temperature, but also can expand its application range. Molybdenum alloys can be classified by strengthening type and alloying elements. The following mainly describes the classification by alloying elements, which is binary molybdenum alloy, multi-element molybdenum alloy, doped molybdenum alloys, rare earth molybdenum alloy and so on.

Binary molybdenum alloy means adding single alloy elements into molybdenum to form molybdenum alloy. Adding tungsten and rhenium in molybdenum, this molybdenum alloy has large alloying elements added quantity and the hardness and heat resistant of alloys is excellent. The molybdenum alloy which added with titanium, zirconium, hafnium and other alloy elements has small alloying elements adding quantity.

Multi-element molybdenum alloy, there are two or more alloying elements added into molybdenum. Multi-element molybdenum alloy has a variety of categories, such as Mo-Ti-Zr-C series, which is an alloy added with a certain amount of zirconium and carbon on the basis of Mo-0.5Ti, including TZC and TZM. Mo-W-Hf-C series and the Mo-W-Hf-Zr-C series have good overall performance, but the preparation process is not mature, including M25WH1, M25WH, H2WM25, and M25WZH1 and so on. Mo-Hf-Zr-O series according to different hafnium doping quantity are divided into different type, including ZHM, ZHM4, ZHM7, and ZHM8.

Doped molybdenum alloy usually doped silicon, aluminum, potassium and other trace elements into molybdenum, which has better high temperature properties. Recrystallization temperature of this it can reach 1750 ℃, and after recrystallization it has some strength and ductility.

Rare earth molybdenum alloy has stable chemical structure and good strengthening effect, which has wide application range.

Email: sales@chinatungsten.com sales@xiamentungsten.com 

Tel.: +86 592 5129696/86 592 5129595

Fax: +86 592 5129797

Annealing Temperature Influence Titanium Zirconium Molybdenum Alloy Properties

Titanium zirconium molybdenum (TZM) alloy after deformation strengthening typically generate residue stress. In order to eliminate residue stress, while changing the properties of the alloy, are generally required to anneal.

After studies found that TZM alloy process vacuum annealing after extrusion after, in which the annealing temperature increased from 950℃ to 1050℃, the strength and the elongation of TZM alloy changed little, but when the annealing temperature increased from 1050℃ to 1600℃, TZM alloy significantly improved elongation, and tensile strength decreased.

In addition, as the annealing temperature increase, the hardness of the TZM alloy is lowered, especially when in 1400~1500 ℃. So we can see, with the annealing temperature increase the hardness of the alloy is lowered very obvious. Therefore, it is considered that grains group up with annealing temperature increases, but can quickly eliminate dislocation, lattice distortion and other defects, so that the ductility of the alloy increases, stretching decreased.

Annealing temperature also make titanium zirconium molybdenum alloy dislocation density changes, TZM alloy annealed at 1450 ℃ for 15 minutes, the dislocation density decreased from the original 3 × 1010cm-2 to 7 × 109cm-2, and the higher the annealing temperature, the shorter the time to reduce the dislocation density.

Titanium Zirconium Molybdenum Alloys Annealing Treatment

When produce the titanium zirconium molybdenum (TZM) alloys, the last step generally required extrusion, forging or pressing, so to improve shaping and processing performance. But TZM alloy after extrusion, forging or pressing will produce residual stress. In order to eliminate residual stress and change the brittleness of the alloy, therefore need to do some annealing treatment. Because the Ti, Zr and C in TZM alloy will cause carbide precipitation and Ti, Zr solid solution so that TZM alloy recrystallization temperature will improve, and the annealing temperature of TZM alloy is generally above 1150 ℃. On the other hand, select the annealing temperature annealing is crucial. Because the annealing temperature can affect not only impact the hardness, but also tensile properties of the alloy can be greater.

Annealing is generally happen in a vacuum or protection of hydrogen, but after some recent studies have found that nitrogen use as a protected gas during annealing, that is making nitriding alloy to alloy during annealing. TZM alloy after nitriding, the base body to produce titanium nitride particle and it can improve the hardness and tensile strength of the alloy.

Molybdenum Properties

The following is the profile of molybdenum properties and it is for your reference.

Molybdenum Bar

Molybdenum Physical Properties
Density	lb/in3	0.369
	gm/cm3	10.30
Melting Point	°F	4760
	°C	2625
Thermal Conductivity	Cal/cm2/cm°C/sec	0.35
Specific Heat	Cal/gm/°C	0.061
Coefficient of Linear Thermal Expansion	micro-in/°F x 10-6	4.90
	micro-in/°C x 10-6	2.70
Electrical Resistivity	micro-ohm-cm	5.17
Recrystalization Temp.	°C	1100

Molybdenum Mechanical Properties
Tensile Strength	KSI (Mpa)-RT	150 (1035)
	KSI (Mpa)-500°C	75 (515)
	KSI (Mpa)-1000°C	25 (175)
Elongation	% in 1.0".	--
Hardness	DPH	230
Modules of Elasticity	KSI	45000
	Gpa	310

Molybdenum Chemistry

Minimum % 99.95

Molybdenum Specifications

AMS 7800

Welcome to molybdenum girl's world, this is Elva from Chinatungsten Online who is the charger of molybdenum products. If you have any interests in molybdenum products, such as molybdenum rod, bar, wire, block, disc, plate, foil, sheet, boat, crucible, part, electrode and molybdenum alloy (TZM, MHC, TZC, ZHM, MoCu etc), please send email (sales@chinatungsten.com) to us or call me by the phone +8605925129696.

纯钼，TZM，MHC，MLa，MY，MW，MCu的比较

TZM合金板

钼(Mo)和钼合金分类

1. 纯钼(Mo)

钼的主要性质如下：
 熔点高、 导热性能好、热膨胀系数小、 电阻小、 蒸发压力低、 弹性模量高、 良好的耐热性能

2. TZM (钛-锆-钼) 合金

TZM合金比纯钼有以下优点：
 耐热性能更好、 再结晶温度高、 抗蠕变性能好、 焊接性能较好

3. MHC(钼-鉿-碳)合金

MHC合金与TZM合金比较具有以下优点：
 耐热性能更高、 抗蠕变性能更好、 再结晶温度更高

4. MLa(钼-镧氧化物)合金

MLa合金与纯钼相比较具有以下优点：
 再结晶温度高、 抗蠕变性能更好、 焊接性能好、 高温使用后塑性好

5. MY(钼-钇氧化物)合金

MY合金与纯钼相比较具有以下优点：
 再结晶温度高、 抗氧化性更好、 焊接性能好、 与玻璃封接有较好的粘着性

6. MW(钼-钨)合金

MW合金与纯钼相比较具有以下优点：
 有较好的抗熔融金属的腐蚀性能、 再结晶温度更高、 强度更高

7. MCu(钼-铜)合金

MCu合金的优点：
具有良好的导热性能、 热膨胀小

钼及钼合金的组成成分比较：

合金类别	主要成份(%)
	W	Ti	Zr	C	La2O3	Y2O3	Hf	Cu
Mo
TZM		0.40~0.55	0.06~0.12	0.01~0.04		0.08~0.14
MHC				0.04~0.12
ML					0.2~3.0
MY						0.2~0.8
MW	20~50
MCu								0.3~30.0

工业钼合金及其应用

合金	标称成分(重量%)	应    用
纯钼 TZM MHC Mo—W Mo—Re Mo—La	99.95Mo 0.5Ti,O.08Zr,0.03C 1~1.5Hf,0.03~0.05C 10~30W 41~47.5Re 0.5—1.5La(呈近La2O3状态)	真空炉、玻璃熔炼、电子器件、热阱 热加工工具、炉子安装用具 热加工工具 熔融锌处理、溅射靶 行波管、火箭助推器 烧结舟皿