Magnesium alloys daim ntawv thov, kev faib thiab cov khoom

Magnesium alloys muaj ib tug xov tooj ntawm cov cim lub cev thiab tshuaj zog, Hmoob cov uas tsis muaj kev ceev thiab siab zog. Tej no zoo nyob rau hauv cov ntaub ntawv nrog qhov sib ntxiv ntawm magnesium tso cai cov khoom thiab lug muaj siab zog yam ntxwv thiab uas tsis muaj ceeb thawj.

magnesium Specifications

Muaj ntau lawm thiab kev siv ntawm magnesium yog tus tsis ntev los no - tsuas yog hais txog 100 xyoo dhau los. Qhov no hlau muaj ib tug uas tsis muaj ceeb thawj, yog vim nws muaj ib tug kuj tsis tshua muaj ceev (1.74 g / smᶟ) zoo stability nyob rau hauv huab cua, alkalis, gaseous xov xwm thiab muaj ib tug fluorine cov ntsiab lus nyob rau hauv ntxhia roj.

nws melting point yog 650 degrees. Nws yog yus muaj los ntawm siab reactivity kom txog thaum lub txawj combustion nyob rau hauv cov huab cua. Ntshiab magnesium Tensile zog yog 190 MPa, modulus ntawm elasticity - 4500 Mpa, elongation - 18%. Hlau muaj ib tug high damping peev xwm (zoo absorbs elastic deeg) uas muab nws nrog ib tug zoo heev tsiv thiab txo poob siab rhiab heev rau resonance phenomena.

Ntawm cov lwm nta ntawm no lub caij no yog zoo thermal conductivity, ib tug tsis tshua muaj peev xwm mus nqus thermal neutrons thiab nrog lub nuclear roj. Vim thaum lawv tseem cov thaj chaw ntawm magnesium yog ib qho zoo tagnrho cov ntaub ntawv uas rau high-kub hermetic plhaub ntsiab ntawm nuclear reactors.

Magnesium zoo alloyed nrog rau ntau yam hlau thiab koom rau cov xov tooj ntawm muaj zog kom txhob muaj kab mob, uas yog tsis yooj yim sua yam uas tsis tau metallothermy txheej txheem.

Nyob rau hauv cov ntshiab daim ntawv nws yog tsuas yog siv raws li tus dopant nyob rau hauv lub alloys nrog txhuas, titanium, thiab ib co lwm yam tshuaj hais. Nyob rau hauv ferrous metallurgy nrog magnesium yog nqa sib sib zog nqus desulfurization ntawm hlau thiab hlau, raws li zoo raws li zoo tuaj thaj chaw ntawm lub kawg ntawm spheroidizing graphite.

Magnesium thiab dopants

Cov feem ntau dopants thov kom magnesium-raws li alloys xws li hais xws li txhuas, manganese thiab zinc. txhuas yog kho los ntawm ib tug qauv tsub kom lub fluidity thiab lub zog ntawm cov khoom. Introduction zinc kuj muaj ntau check alloys nrog txo grain loj. Siv manganese los yog zirconium tsub kom xeb kuj magnesium alloys.

Qhov sib ntxiv ntawm zinc thiab zirconium muab nce lub zog thiab ductility metallosmesey. Thiab lub xub ntiag ntawm tej yam uas tsis tshua muaj lub ntiaj teb hais xws li neodymium, cerium, yttrium thiab li ntawd., Txhawb nqa ib tug tseem ceeb nce nyob rau hauv tshav kub tsis kam thiab maximize tus neeg kho tshuab thaj chaw ntawm magnesium alloys.

Yuav kom tsim ultralight khoom muaj ib tug ntom ntawm 1.3 rau 1.6 g / nyob rau hauv mᶟ lithium alloys yog tswvcuab. Qhov no additive yuav txo tau lawv cov luj los ntawm ib nrab piv nrog txhuas metallosmesyami. Yog li lawv indices plasticity, fluidity, processability thiab elasticity muaj nyob rau ntawm ib tug siab dua theem.

Classification alloys nrog magnesium

Magnesium alloys yog txwv kom muab zais raws li ob peb kev. Lawv yog:

• los ntawm cov qauv ntawm cov ua - los ntawm casting thiab wrought;
• raws li cov neeg kawm ntawv ntawm rhiab heev rau thaum tshav kub kub kho mob - nyob rau hauv neuprochnyaemye thiab lub hardening tshav kub kev kho mob;
• Cov khoom thiab daim ntaub ntawv - mus hlau tshav kub-resistant, siab zog thiab general-lub hom phiaj;
• los ntawm doping system - muaj ntau ntau pab pawg neuprochnyaemyh thiab tawv los ntawm tshav kub kev kho mob wrought magnesium alloys.

casting alloys

Qhov no pab pawg neeg no muaj xws li qhov sib ntxiv ntawm magnesium alloys, npaj rau zus tau tej cov ntau yam ntawm qhov chaw thiab lub ntsiab los ntawm pwm casting. Lawv muaj sib txawv txhua yam khoom, nyob ntawm seb uas yog muab faib ua peb cov chav kawm ntawv:

• sredneprochnye;
• siab zog;
• Thaum tshav kub kub-resistant.

Raws li cov tshuaj nyob tus yeees ntawm alloys yog tseem muab faib ua peb pawg:

• txhuas + magnesium + zinc;
• + Zinc + magnesium zirconium;
• Mg + Zr + tsawg earths.

Alloy castability

Qhov zoo tshaj plaws castability zog cov khoom ntawm peb pab pawg muaj txhuas-magnesium alloys. Lawv yuav mus rau cov chav kawm ntawv uas muaj ntaub ntawv uas muaj zog (220 MPa), li ntawd, lawv yog cov zoo tshaj plaws kev xaiv rau ua cav qhov chaw aircraft thiab lwm yam tsheb khiav hauj lwm nyob rau hauv tej yam kev mob ntawm txhua yam thiab thermal loads.

Yuav kom txhim kho lub dag lub zog yam ntxwv ntawm txhuas-magnesium alloys thiab lwm yam hais yog doped. Tab sis muaj cov hlau thiab tooj liab impurities yog undesirable, txij li thaum cov ntsiab muaj ib tug tsis ntxim rau cov weldability thiab corrosion kuj ntawm lub alloys.

Casting magnesium alloys npaj nyob rau hauv ntau hom ntawm melting furnaces: ib tug Reflector, ib tug crucible nrog roj, roj los yog hluav taws xob rhuab crucible los yog induction units.

Nyob rau hauv thiaj li yuav tiv thaiv kom txhob combustion nyob rau hauv tus txheej txheem ntawm melting thiab casting siv tshwj xeeb flux thiab additives. Castings yog npaj los ntawm cov xuab zeb casting, plhaub casting thiab plaster, nyob rau hauv siab thiab siv peev qauv.

wrought alloys

Piv nrog rau lub casting, wrought magnesium alloys muaj ntau dua lub zog, ductility thiab toughness. Lawv yog siv rau lub zus tau tej cov preforms txoj kev dov, nias thiab xuas nrig ntaus. Raws li lub tshav kub kev kho mob cov khoom yog thov ntawm ib tug kub ntawm 350-410 hardening degree, ua raws li los ntawm txias arbitrarily tsis laus.

Thaum cua sov rau cov yas thaj chaw ntawm xws ntaub ntawv nce, yog li cov ua ntawm magnesium alloys yog nqa tawm los ntawm txoj kev siab thiab sov siab. Stamping yog ua nyob rau ntawm 280-480 degrees nyob rau hauv siab los ntawm kev txhais tau tias ntawm kaw hnub. Thaum txias ntxuag ua heev intermediate recrystallization anneals.

Thaum Vuam magnesium alloy khoom leeg lub zog yuav raug muab txo rau cov theem qhov twg ua jelly, vim hais tias ntawm qhov rhiab heev ntawm tej ntaub ntawv rau overheating.

Cov cheeb tsam ntawm daim ntawv thov los ntawm kev ntxiv magnesium alloys

By casting txoj kev, deformation thiab kub kev kho mob ntawm alloys ua txawv semi - ingots, daim hlau, profiles, los xij, Forgings, etc. Cov teb yog siv rau lub zus tau tej cov ntsiab thiab cov ntsiab lus ntawm niaj hnub kev pab kiag li lawm qhov twg hnyav plays lub luag hauj lwm efficiency lug (txo nyhav) thaum tswj lawv lub zog zog. Nyob rau hauv kev sib piv nrog txhuas magnesium yooj yim rau 1.5 lub sij hawm, thiab nrog steel - 4.5.

Tam sim no, siv cov magnesium alloys yog dav xyaum nyob rau hauv lub khoos kas aerospace, automotive, cov tub rog thiab lwm yam lag luam, qhov twg lawv cov qib high nqi (ib co hom muaj nyob rau hauv lawv cov muaj pes tsawg leeg kim heev alloying ntsiab) yog tsis txhaum los ntawm ib qho nyiaj txiag taw tes ntawm view, muaj peev xwm tsim tau ntau check, ceev, haib thiab kev nyab xeeb uas tau khiav lag luam zoo nyob rau hauv cov huab tej yam kev mob, nrog rau thaum muaj kev kub kub.

Vim lub high school lub electric tej zaum, cov alloys yog qhov zoo tshaj plaws cov ntaub ntawv uas los tsim protectors uas muab electrochemical tiv thaiv ntawm steel lug, xws li tsheb qhov chaw, underground lug, roj platforms, ships, etc., los ntawm xeb dab noj qhov chaw nyob rau hauv tus ntawm noo noo, tshiab thiab marine dej.

Alloys tau siv nrog rau qhov sib ntxiv ntawm magnesium nyob rau hauv qhov sib txawv xov tooj cua tshuab nyob rau hauv uas acoustic kab yog ua los ntawm ultrasonic ncua kab rau hluav taws xob Pib ntsais koj teeb.

xaus

Niaj hnub nimno kev lag luam qhov chaw nce siab dua xav tau nyob rau hauv cov ntaub ntawv nrog rau lawv tus lub dag lub zog, hnav kuj, corrosion kuj thiab workability. Cov kev siv ntawm magnesium alloys yog ib tug ntawm cov tseem pheej chaw, li ntawd, cov kev tshawb fawb uas muaj feem rau cov kev tshawb fawb rau cov tshiab thaj chaw ntawm magnesium thiab nws tau siv, tsis txhob tso tseg.

Tam sim no, siv cov magnesium-raws li alloys los ua ib tug ntau yam ntawm qhov chaw thiab lug peev xwm ua tau los txo lawv cov luj los ntawm yuav luag 30% thiab ua rau kom lub tensile lub zog ntawm 300 MPa, tab sis, raws li cov kws tshawb fawb, nws tsis yog cov kev txwv rau qhov no cim hlau.